THE LAWS OF SHABBAT

By Rav Yosef Zvi Rimon

 

 

 

Shiur #03: BORER (Part 3)

 

VI) Defining a Mixture

 

 

Is it permissible to select a book from a bookcase on Shabbat?  Is one permitted to take a piece of meat out of sauce?  Is it permissible to strain the oil from a can of tuna or sardines?  Is oane permitted to spill out the whey which has accumulated on top of sour-milk?  Is it permissible to move a coat in a closet in order to get to one hanging behind it?  How may one sort spoons and forks well in advance of a meal? 

 

It is clear that to be liable for borer (selecting), there must be a mixture, or ta'arovet.  There is certainly no problem with clearing a plate off the table, even if this is done for the next morning, despite the usual requirement of immediate use to permit an act of bereira (selection).  The Tosefta (16:9 in the Lieberman edition; 17:6 in the standard edition) says so explicitly:

 

One may pick scattered fruits one by one and eat them.  If fruits are mixed with fruits, one may select and eat...  If one selects each type on its own, or if one picks out dirt and pebbles, one is liable. 

 

In other words, there is no prohibition of borer with scattered fruit.  Only when "fruits are mixed with fruits" is the prohibition of borer applicable (so that one can become liable for it).  This is also clear in the formulation of the Rambam (8:13), who writes "If two types of food are mixed together before one..."  The Bei'ur Halakha (319:3, s.v. Le’ekhol miyad) interprets the Rambam's words:

 

It appears that there is not even a rabbinical prohibition... as is implied by the language of the Rambam and the Shulchan Arukh who specify that "two types of food are mixed together before one," etc. – implying that if they are not mixed together, borer is inapplicable to selecting one type from another.[1]   

 

SEPARATE AND RECOGNIZABLE PIECES

 

In his Responsa (Ch. 57), the Terumat Ha-deshen discusses pieces of fish which are laid out on one plate or platter separately: is the prohibition of borer applicable in this case?  According to him, there is a logical argument to be lenient in this case:

 

It would be strange to apply bereira to large pieces of distinct and separate types which are sitting in the same place.  Consider the language of the Mordekhai... who writes, "Thus, a person must be careful with types of fruits that are mixed," etc. — implying that only when they are blended and no longer distinct [is borer applicable].  However, in a case like this, even though each type is not arranged on its own, they are not considered to be mixed.  Nevertheless, since the Semag writes that one who selects pesolet from okhel — even if one does so for immediate use — is liable, we may not make this distinction and rule leniently without compelling proof.  

 

Ultimately, the Terumat Ha-deshen rules that since we are talking about a Torah prohibition, we should not be lenient without a clear proof; we must not permit borer unless we are talking about one type.  The Rema (319:3) rules accordingly:

 

Two types of fish are called two types of food, and it is forbidden to select one from the other except by hand in order to eat them immediately, even though the pieces are large and each one is distinct.

 

According to this, a ta'arovet is not only a fully-blended mixture; even large items which are situated next to each other, each of which is distinct in its own right may carry the classification of ta'arovet.[2]   

 

Lone Pieces

 

However, some Acharonim have limited the words of the Rema.  The Arukh Ha-shulchan (319:17) writes that only where there are many pieces is it considered a ta'arovet:

 

However, if one has four or five pieces, taking a piece or two is not called bereira.  These are everyday occurrences: one has on a platter [pieces of] beef and chicken — for they are certainly two types — and the hostess takes chicken off the platter to put it away for the next morning... In fact, if we propose to apply the law of bereira every time we encounter two types of food together, even if they are few in number, it would be impossible to live, and Heaven forbid that we say such a thing!

 

According to him, this stringency is only logical when the large, distinct pieces are numerous, not few.  Consequently, it would seem that if one is clearing the silverware off a table and is holding just one knife, one spoon and one fork, there is no problem to set down each in its place in the silverware drawer.

 

Books in a Bookcase

 

The Shevitat Shabbat (Borer, Be'er Rechovot, 25) limits the Rema's stringency from another direction:

 

The Terumat Ha-deshen is talking about items that are mixed together randomly and are in each other's way, a situation wherein one cannot take a piece until one removes the other from the platter... However, when each is sitting in its place — e.g., books which are arranged in a box or fruits laid out on a board — and not sitting on top of another, bereira is not applicable.

 

This ruling limits the stringency of the Rema and the Terumat Ha-deshen to a situation wherein one must move an unwanted item in order to reach a wanted item.  Consequently, books in a bookcase with visible titles are not in a ta'arovet, so borer does not apply.[3]  The same would apply to articles of clothing lying next to each other that are easily identifiable; only a pile of socks or a heap of books would be considered a true ta'arovet.

 

A Piece in Liquid

 

In a similar way, the Shevitat Shabbat (ibid., 11) allows taking large pieces out of liquids. 

 

If flies fall into a cup, one must not remove the flies alone, because this is like selecting pesolet from okhel, which is forbidden...  This is true only of flies and the like, as sometimes they sink and become blended in to the drink; when it comes to large, noticeable items, however, such as meat sitting in sauce or vegetables pickled in brine, we have not found that taking them out of the liquid would be bereira. 

 

According to this, one may remove a piece of meat from soup or gravy, since there is no ta'arovet.  Other Acharonim (Az Nidberu, Vol. IV, Ch. 21; Chiddushim U-vei'urim, Shabbat, Ch. 14, 17) agree that the prohibition of borer does not apply to large pieces in liquid and that it is permitted to remove the piece or the liquid — even using a utensil, such as the lid of a pot or a can.

 

All this is true for large pieces, but small pieces which are difficult to remove are considered to be in a ta'arovet, and one must avoid selecting them.  Therefore, it is permitted to drain oil the out of a can of (whole) sardines, but it is forbidden to drain it out of a can of tuna (which is cut into small pieces).  For the same reason, one must not remove water from a can of peas or corn and the like (unless one pours out the peas and corn as well).  Similarly, one may pour out the water from a jar of pickles, but not from a jar of olives. 

 

A TA'AROVET AT THE POINT OF CONTACT

 

Sometimes, the two types are not totally blended but are only touching at a given point.  In such a situation, only the point of contact is considered a ta'arovet, so one may remove either okhel or pesolet as long as one does not directly affect that part.        

 

An example of this is the cream on top of the milk.  As the Mishna Berura (319:62) writes:

 

Skimming the cream floating on top of the milk is included in borer, so one must be careful when one is approaching the level of the milk to leave a bit [of the cream], and then it is permitted...  Alternatively, one may take a bit of the milk along with the cream [but to take only the cream and none of the milk is forbidden — even if one intends to eat it immediately — since one is removing it with the spoon].

 

According to this, only at the exact point where the cream meets the milk is there a ta'arovet; separating it from a different point involves no act of bereira.  Similarly, the Mishna Berura (ibid., 55) forbids pouring out fat which is floating on top of gravy, unless one also spills out some gravy.

 

Rav Neuwirth, in Shemirat Shabbat Ke-hilkhata (3:19), rules that one may not pour the whey off of sour-milk and yogurt, unless one also pours off some of the sour-milk.  However, this is questionable.  Firstly, sometimes the sour-milk is hard, in which case the whey is totally separate.  Indeed, Rav Moshe Feinstein (Iggerot Moshe, Vol. IV, Ch. 74, Borer, 6) allows one to take the "skin" off of the milk, since it is separate from the milk, as opposed to the cream. 

 

Is there a distinction between removing the "skin" on pasteurized milk and removing cream which is floating on milk...? 

 

Answer: It is obvious that removing this "skin" is permissible, because it is totally separate from the milk.  This is easier to permit than [the removal of] the skin of garlic or onions, at the end of Ch. 321, because [this "skin"] is edible, and it is not comparable to the Magen Avraham's cream, which is a liquid which has congealed somewhat...  This tiny bit of cream on top of all milk is as much a liquid as the milk below it.

 

Secondly, it may be that most people eat the sour-milk with the whey, and if so, this should apparently be considered one type (because the whey is part of the sour-milk), and there would be no prohibition of borer.[4]

 

Cantaloupe and Watermelon Seeds

 

Concerning cantaloupe seeds, Rav S.Z. Auerbach (cited in Shemirat Shabbat Ke-hilkhata, Ch. 3, n. 94) rules:

 

The seeds which can be easily removed from the cantaloupe are not mixed at all [with the flesh of the cantaloupe]...  Even when it comes to the individual seeds which are left, one may still note that these seeds are not adhering and attached [to the flesh], but merely sitting on top of it.  There is no need for discernment in order to remove them, as one requires in removing the cream from the milk and the like, so it is logical that there would be no prohibition of bereira, and in any case it would be permissible immediately before the meal.

 

According to him, even at the point of contact, the seeds and the flesh are not considered mixed, and one may dispose of the seeds normally.  (The same applies to the top layer of watermelon seeds; see Az Nidberu, Volume I, Chapter 26.)  One may even be lenient with the few seeds that remain on the cantaloupe.  However, he recommends waiting until right before the meal, which allows us to enlist those who permit bereira when there is no other way to get to the fruit. 

 

A LAYERED MIXTURE

 

The Bei'ur Halakha (319:3, s.v. Le-ekhol miyad) expresses some doubts as to whether a layered mixture is a ta'arovet.  At first he presents a lenient view:

 

When there is one type and another type below it on a plate, and one removes the upper layer in order to get to the lower layer... it appears that there would not even be a rabbinic prohibition...  As the language of the Rambam and Shulchan Arukh indicates — "If two types of food are mixed together before one" — there is no problem in selecting one from the other if the types are not mixed. 

 

However, later on, he equivocates:

 

One may want to insist and claim that since each type is not arranged alone, they are considered mixed and bereira applies.  Nevertheless, it appears that one should be stringent only regarding removing a layer from above with intent to leaving it for a later point... but if one has no such intent and is simply removing this layer in order to get to the type below, this in no way falls into the category of borer.  Furthermore, consider the ruling of the Shulchan Arukh above, 316:7, permitting trapping a snake if one is only trying to prevent it from biting... since one does not care about the hunting itself and simply wants to distance it from him, it is not considered to be a Torah melakha.  The same applies here when one wants to remove a layer just to get at what is below.  Separating pesolet out of okhel is different, because the okhel is improved through one's bereira, but that is not the case here, as the lower type is not improved all through this separation.

 

According to him, the melakha of borer in the context of a normal ta'arovet is forbidden for two reasons: 1) the very separation between okhel and pesolet and 2) the result of the bereira: fixing the okhel.  With a layered mixture, on the other hand, only the first issue exists, while the second issue, fixing the okhel, is not relevant, since in point of fact the types are not truly mixed together, and removing one is not considered a true tikkun of the other. 

 

Based on this, the Bei'ur Halakha writes here (also see Mishna Berura ibid., 15) that in a layered mixture it is permitted to remove the upper type in order to get to the lower type.  An action such as this is not considered to be selection and separation between two things, because the person is totally uninterested in the upper type.  One's sole aim is to remove that which impedes access to the lower level; thus, there is no tikkun, because there is no true ta'arovet, and the lower type is not improved thereby.[5]  

 

Since neither aspect of the prohibition of borer exists here, this act cannot be regarded as bereira, and it would be permitted even if one does not intend to use the lower type immediately (as Rav Chayim Kanievsky, cited by the Ayil Meshullash, Ch. 4, n. 77, writes), as long as one's aim is not to sort or to set aside the upper level, but simply to remove the lower level.

 

The view of the Bei'ur Halakha indicates that one is allowed to do this only with a layered mixture.  When it comes to an absolute mixture, on the other hand, even if one is uninterested in the pesolet and is only removing it in order to get to the okhel, there is still a prohibition of borer.  Though there is no selection and separation, there is a tikkun of the okhel, and therefore it is forbidden.  Only with a layered mixture may one remove the unwanted layer.[6] This is true even if the upper layer is true pesolet, since the same logic applies (as Rav Chayim Kanievsky, cited by the Ayil Meshullash, Ch. 4, n. 82, writes).

 

A Pile of Books or Papers

 

One may not sort a pile of books, but one is allowed to remove books on top in order to get to a book on the bottom (even if one must remove many books until one gets to the desired volume).  For example, one may have numerous prayer-books and desire to separate it by rite (Ashkenazic vs.  Sephardic), or one may want to separate prayer-books from Chumashim.  Based on what we have seen, this act is problematic (even though one may take away the upper volumes in order to get to the desired book), and therefore it is preferable simply to put the books in the bookcase without sorting them or to have each person take his or her prayer-book and place it in its right place.  (This would also show the proper moral consideration for the sextons.)  One may also take each book out of the pile, peruse it briefly and then put it in its proper place (Ayil Meshullash 18:3).

 

Nevertheless, one should not criticize one who sorts a pile of prayer-books in the normal way (as Rav Chayim Kanievsky, cited by the Ayil Meshullash, Ch. 18, n. 14, writes), as there are those who rule (Or Same'ach 8:11; see also Chiddushim U-vei'urim, Shabbat, Ch. 14, 15, s.v. Sham) that bereira does not apply to books, while others hold that there is no bereira for a layered mixture, all the more so when one can see the title of each book on its spine.[7]  Similarly, one may first put the books on the shelf, so that the title of each is immediately visible; they are then no longer considered to be mixed, so that one may then sort them (see Shulchan Shelomo 319:1, 4; 2). 

 

What about weekly parasha sheets?  If they are lying one on top of the other, this is a layered mixture, so one may remove the upper ones in order to get to the desired parasha sheet.  This is permissible even for later use.

 

However, if the sheets are truly mixed together haphazardly, one may not remove an unwanted sheet.  In this case, one must peruse each removed sheet briefly until one gets to the desired sheet.  It may be that there is another way to permit this: one may arrange the pile so that each sheet lies directly on top of another; one may then have a layered mixture.  (It does not appear to be at all problematic to arrange a pile of printed matter in this way.)

 

PERMITTED METHODS OF SORTING

 

As we have seen above, the halakhic consensus is to forbid selection of silverware and other utensils (although there are those who permit this).  Is there then any unanimously permissible way to sort utensils?  One may of course do so immediately before the meal, but there are other solutions.

 

Scattering the Mixture

 

One solution is found in the Gemara (74a) itself:

 

When Rav Dimi arrived, he said: "It was the Shabbat of Rav Bivi, and Rabbi Ammi and Rabbi Assi happened to be there.  He poured out before them a basket of fruit, but I do not know if it was because he maintains that that okhel from pesolet is forbidden, or because he intended to be magnanimous."

 

In this anecdote, Rav Bivi pours out a basket containing fruit and pesolet rather than picking out the pesolet.  As Rashi explains,

 

He did not want to select the food from the leaves and put in front of each and every one [of his guests], but rather he poured [the fruits] out and each [guest] took and ate.  In this act of pouring out, the food becomes separated and independent.

 

The Gemara has its doubts: is Rav Bivi avoiding the prohibition of borer, or is he just demonstrating that he has a cornucopia of fruit?  Regardless, we see that one can overcome the prohibition of borer by scattering the ta'arovet — once the items are dispersed and no longer mixed, the prohibition of borer is not applicable, and there is no problem to sort them or to remove the pesolet from the okhel.  Rav Moshe Feinstein writes (Iggerot Moshe, OC Vol. IV, Ch. 74, Borer, 11) that "this is a good idea," and Rav S.Z. Auerbach concurs (Shemirat Shabbat Ke-hilkhata, Ch. 3, n. 6).[8]

 

Sorting as a Byproduct

 

Another permissible way to sort is to remove the item from the mixture without the aim of sorting, but for another aim.  Rav Neuwirth rules (Shemirat Shabbat Ke-hilkhata 3:78):

 

One may not sort silverware in order to put each one in its own slot.  It is forbidden as well to remove all the utensils of one type simultaneously, dry them and return them to their slots.  However, to put the utensils in their slots immediately after drying, as one takes each utensil randomly and dries it on its own — this is permissible.

 

In a note there (210), he explains in the name of Rav S.Z. Auerbach: "One is not selecting and sorting; rather, one dries and puts in its place whatever comes into one's hand."  That is to say, if there is a ta'arovet of wet silverware, one may randomly remove each utensil and dry it, and after that it is permissible to put each wherever one wants (e.g., forks in one slot, knives in another, etc.).  This action is not forbidden as an act of sorting, since the removal of the utensil from the ta'arovet is done randomly — "whatever comes into one's hand" — without any intent to sort, and since the utensil is already separated from the mixture, there is no problem to put it in its proper place.  The same applies when there is a mixture of dirty utensils in a sink: it is permissible to take each time a utensil randomly and to wash it, and after that it is allowed to put it wherever one wants.

 

However, this is only allowed when one takes out the utensils randomly in order to wash them or dry them.  It is not permissible to take out the utensils randomly from the mixture in order to put each one in its proper place later, since in this case we see the two actions as one act of sorting, which is forbidden. 

 

 

      

 

 

VII) Removing Pesolet with a Bit of Okhel

 

 

How may one remove a fly which has fallen into a drink?  Is it permissible to remove a bone with some meat on it?  May one remove the label which is stuck to a loaf of bread? 

 

The Taz (319:13) writes that if a fly falls into one's drink, it is forbidden to remove the fly alone, but it is permissible to take it out with a bit of liquid:

 

There is a prohibition, when flies fall into a cup, of removing the flies alone from the cup, as this is analogous to selecting pesolet; rather, one must take a bit of the drink with them.

 

The Mishna Berura (ibid., 61) rules in accordance with the view of the Taz and expands it to other circumstances.  From his words, it appears that every time one removes pesolet with a bit of okhel, there is no violation of borer:

 

Therefore, when a fly or something else falls into one's food or drink, one must not remove the fly, whether manually or with a utensil, because this is selecting pesolet from okhel; rather, one must take a bit of the food or drink with it and toss it.

 

The Chazon Ish (53, s.v. Taz) argues forcefully with this approach:

 

The Taz's solution of taking some liquid with it requires further analysis.  Presumably, every time one selects pesolet from okhel, taking a bit of okhel with the pesolet would still be prohibited.  As long as one's intent is for the remainder of the okhel to be purified, does one care about a bit of the okhel which comes out with the pesolet?  Similarly, one's action here proves that one has no intent to split the drink between vessels; one wants to clean out the fly from the cup!  In what way is the melakha deficient if one takes a bit of the drink, as one's whole intent is to circumvent the prohibition of removing the fly alone? 

 

The Chazon Ish sees the Taz's reasoning as follows: if one is not separating precisely between the fly and the drink, but rather is removing the fly with a bit of liquid, one is merely dividing the drink between two vessels, the cup and the spoon.  The Chazon Ish objects to this, as it is clear that this is a ruse; one's intent is obviously to "fix" the drink by removing the fly, and this is a classic example of bereira.  What then does it help if one removes a bit of the drink alongside the fly?

 

Similarly, the Chazon Ish (54:3) disputes the view of the Mishna Berura, that it is permissible to remove a bone with a bit of meat on it (even if one has no intention of eating this bit of meat), because one is removing the pesolet with a bit of okhel.  The Chazon Ish argues, writing that "one is not thinking about the meat, but about picking the plate clean."

 

As we mentioned in our first shiur, this argument apparently depends on the underlying rationale of the melakha of borer.  The Chazon Ish maintains that the basis of the melakha is tikkun okhel (fixing the food), and therefore even if one removes the pesolet with a bit of okhel, it is still forbidden; at the end of the day, the ta'arovet is "fixed" through one's action.  The Taz and the Mishna Berura understand, apparently, that the basis of the melakha of borer is hotza'at pesolet (removing refuse), or severing the connection between the okhel and the pesolet, and since in this case one is not removing the pesolet alone and is not disconnecting absolutely between the okhel and the pesolet, there is no prohibition.[9] 

 

According to the Chazon Ish, separating in this manner involves a Torah  prohibition.[10]  According to the Taz and the Mishna Berura, this method is totally permissible. 

 

It should be noted that the Chazon Ish (53, s.v. Taz) suggests an alternate explanation for the words of the Taz:

 

Indeed, one may say that the wine on the body of the fly has the status of being in a ta'arovet, and therefore the Taz maintains that if one takes the fly itself, it is considered borer in separating the wine on the fly and between its wings from the rest of the wine, and therefore one should take a bit of the liquid with it.  Meanwhile, the remaining liquid certainly has no status of borer, as the fly was not mixed in it at all.

 

In other words, it may be that the fly is not considered to be mixed with the drink in the cup, but only with the liquid that is clinging to its body; if so, when one removes the fly with the liquid which is around it, it turns out that one takes the entire area of the ta'arovet, and there is no action of bereira.[11]  According to this, the Taz rules leniently only when the pesolet is not fully blended with the okhel, but if the pesolet is fully mixed in (such as bones in meat), the Taz would concede that one may not take the pesolet with a bit of okhel[12] (against the view of the Mishna Berura, who rules leniently regardless). 

 

This argument has an important halakhic ramification, as we often encounter pesolet in our okhel.  According to the Mishna Berura, the solution is simple: it is possible to take the pesolet with a bit of okhel, and to do so is permissible.  According to the Chazon Ish, on the other hand, there is a Torah prohibition!  The same applies to a bone with some meat on it, as well as pesolet that one removes with a bit of okhel. 

 

However, even according to the Chazon Ish, there are cases in which one may be lenient:

 

1.    When one takes along with the pesolet a large quantity of okhel — in this case, the Chazon Ish concedes that it is permissible, since this is considered dividing a ta'arovet in two, not an action of bereira.[13]

2.    When one removes the pesolet with a bit of okhel and eats the okhel stuck to the pesolet, e.g., if one removes a bone with some meat and eats that meat.  In this case, the bone is deemed insignificant relative to the meat, and one is considered to be selecting okhel from okhel (Chazon Ish 54:3). 

3.    When the pesolet is not considered to be mixed throughout the okhel, but connected only at their point of contact — in this case, even the Chazon Ish allows one to remove the pesolet with the okhel stuck to it, since one removes the entire area of the ta'arovet, as the Chazon Ish writes concerning a fly in a ta'arovet with the liquid around it. 

 

According to this, a tag stuck to a loaf of bread may be removed along with a bit of bread even according to the Chazon Ish, and the same applies to the fat on top of soup.  One may even be allowed to remove them without any of the okhel stuck to them if one does so just before the meal, as one is allowed to peel fruit under such conditions (as we will discuss in our next shiur).  It is nevertheless preferable to remove them along with a bit of the okhel.[14]

 

Practically, the halakhic consensus is to follow the lenient view of the Mishna Berura (see Shevitat Shabbat, Borer, Be'er Rechovot, 20).  However, wherever possible, it is preferable to select in ways that even the Chazon Ish would approve of (by tasting the bit of okhel one removes or by removing a large quantity of okhel), as according to his opinion, one may violate a prohibition on a Torah level, and his argument is quite convincing, as we explained above.[15]  Similarly, even one who rules leniently, following the Mishna Berura, should remove the pesolet with a greater amount of okhel then one would normally discard.[16]

 

Conclusion

 

To summarize, one may remove an insect from a drink using a spoon in such a way that the insect and some of the adjacent liquid are in the spoon.  According to the Mishna Berura's view, one may generally remove pesolet with a bit of okhel.  However, it is preferable to be stringent, taking the Chazon Ish into account, and to taste a bit of the okhel or to remove a relatively large amount of the okhel.  When the pesolet is stuck to the okhel at one point, e.g., a tag stuck to a loaf of bread, one may remove the pesolet along with a bit of okhel according to all opinions. 

 

 

 

 

 

 

 

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The Chazon Ish sees the Taz's reasoning as follows: if one is not separating precisely between the fly and the drink, but rather is removing the fly with a bit of liquid, one is merely dividing the drink between two vessels, the cup and the spoon.  The Chazon Ish objects to this, as it is clear that this is a ruse; one's intent is obviously to "fix" the drink by removing the fly, and this is a classic example of bereira.  What then does it help if one removes a bit of the drink alongside the fly?

 

Similarly, the Chazon Ish (54:3) disputes the view of the Mishna Berura, that it is permissible to remove a bone with a bit of meat on it (even if one has no intention of eating this bit of meat), because one is removing the pesolet with a bit of okhel.  The Chazon Ish argues, writing that "one is not thinking about the meat, but about picking the plate clean."

 

As we mentioned in our first shiur, this argument apparently depends on the underlying rationale of the melakha of borer.  The Chazon Ish maintains that the basis of the melakha is tikkun okhel (fixing the food), and therefore even if one removes the pesolet with a bit of okhel, it is still forbidden; at the end of the day, the ta'arovet is "fixed" through one's action.  The Taz and the Mishna Berura understand, apparently, that the basis of the melakha of borer is hotza'at pesolet (removing refuse), or severing the connection between the okhel and the pesolet, and since in this case one is not removing the pesolet alone and is not disconnecting absolutely between the okhel and the pesolet, there is no prohibition.[9] 

 

According to the Chazon Ish, separating in this manner involves a Torah  prohibition.[10]  According to the Taz and the Mishna Berura, this method is totally permissible. 

 

It should be noted that the Chazon Ish (53, s.v. Taz) suggests an alternate explanation for the words of the Taz:

 

Indeed, one may say that the wine on the body of the fly has the status of being in a ta'arovet, and therefore the Taz maintains that if one takes the fly itself, it is considered borer in separating the wine on the fly and between its wings from the rest of the wine, and therefore one should take a bit of the liquid with it.  Meanwhile, the remaining liquid certainly has no status of borer, as the fly was not mixed in it at all.

 

In other words, it may be that the fly is not considered to be mixed with the drink in the cup, but only with the liquid that is clinging to its body; if so, when one removes the fly with the liquid which is around it, it turns out that one takes the entire area of the ta'arovet, and there is no action of bereira.[11]  According to this, the Taz rules leniently only when the pesolet is not fully blended with the okhel, but if the