AAQ, thanks for the kind words about my posts!
Now, about the Gemoro in Chullin:
1) It isn’t a double reference, “da’as – da’as Torah.” The Gemoro is explaining a B’raisa which uses the word da’as, and the Gemoro is asking if da’as in the B’raisa means Da’as Torah. So the first ??? is part of the question, and not part of the phrase ??? ????. (This is the same mistake that appears on every ??? ????? which uses the phrase ???? ????. This phrase is a quotation from Sanhedrin 5a, but there too the first ???? is a question (can he pasken?) and the second is the answer. So a ??? ????? should really say ???? just once.)
2) The phrase does not refer to ????; rather, it refers to a ????: either the ? of ???? or the phrase ?????? ??? teaches us (according to Rebbi Yehuda) that the ????? ??? ???? only applies to the right sciatic nerve. So what makes you think your teacher was unaware of this Gemoro, seeing as it has nothing to do with the concept of ??? ???? that we’re discussing?
