The Gemara moves on to the mishnah''s case of an animal that was missing a liver -- which is surely a treyfa -- but what if an olive's worth remained? That seems to define the animal as a kosher animal. But less than a "kezayit" amount of the liver seems that it would get that treyfa distinction. Also, 4 rulings - listed with a mnemonic. Including the case of creepy crawlies - and the question of them not bleeding, with implications for Shabbat -- all as a parallel to a punctured (or not!) lung. But note throughout here the lack of attack among the sages, despite all the differences of opinion, and with practical implications.