The Gemara continues evaluating the position that exactly half of a siman is considered like a majority (mechtza kerov). Two difficulties are raised from braitot concerning pausing after slaughtering half a siman, or a siman that was pre-damaged. Ultimately, the Gemara rejects the initial understanding of Rav's statement regarding shechita and concludes that everyone agrees 50% is not a majority. The original debate between Rav and Rav Kahana applies exclusively to the laws of Pesach, in a case where the population is exactly half ritually pure and half impure.

The Gemara notes a repetitive phrasing in the Mishna regarding the rule that a majority of a siman is sufficient. It explains that one sentence is needed for regular slaughter (chullin) and a second sentence for sacrifices (kodashim), as neither could be logically derived from the other. Various textual proofs and linguistic analyses of the Mishna's phrasing are brought by five Amoraim, each proving in a different way that the first sentence deals with chullin and the second with kodashim.

A fundamental debate is introduced between Reish Lakish and Rabbi Yochanan over whether shechita takes effect continuously from the beginning of the act until the end (yeshna leshechita mitchila ve'ad sof), or if it only takes effect at the very final moment (eina leshechita ela basof). Rava and Rav Yosef narrow the scope of the dispute, noting that everyone agrees in certain scenarios, but they differ over what exact case is actually the subject of the disagreement between Reish Lakish and Rabbi Yochanan.

Rabbi Zeira raises a difficulty from a Mishna in Para against the opinion of Rabbi Yochanan that shechita applies from beginning to end. However, Rava refutes his difficulty and instead raises a counter-difficulty from that same Mishna against the opinion of Reish Lakish that shechita only takes effect at the final moment.