Zeiri rules that if an animal or bird's neck bone is broken and the majority of the surrounding flesh is severed, it immediately becomes a neveila (carcass), even if it is still convulsing. Rava challenges this: if this state constitutes a neveila, how can melika be validly performed on a sacrificial bird, given that the process begins by breaking the neck? Rava answers that in melika, the kohen breaks the neck bone and spinal column without simultaneously severing the majority of the surrounding flesh. Rabbi Ami answers the challenge in the same manner, and his and Rava's answers are supported by a braita.

The braita notes that in a bird burnt offering (olat ha'of), either the majority of both simanim or both simanim in their entirety must be cut. Because the Sages and Rabbi Elazar b'Rabbi Shimon dispute whether both simanim must be completely severed or if cutting the majority suffices, the Gemara suggests two interpretations to align the braita with one or both of these respective opinions.

Rav Yehuda in the name of Shmuel applies Zeiri's principle to humans, ruling that if a person's backbone and the majority of the surrounding flesh are severed, they immediately impart ritual impurity in a tent (tumat ohel) like a corpse, even if the body is still convulsing. Rabbi Yochanan introduces an additional case where the legal moment of death is determined immediately despite lingering convulsions.

A parallel case regarding sheratzim (creeping creatures) is brought from a Mishna, prompting a debate between Reish Lakish and Rabbi Ami over whether "cutting off the head" means a complete detachment or a partial one, similar to the opinion of Rabbi Elazar b'Rabbi Shimon concerning a bird burnt offering.

The Gemara introduces a braita to show the source for the debate between the rabbis and Rabbi Elazar b'Rabbi Shimon in a bird burnt offering. The braita presents three distinct opinions on the biblical term "k'mishpat" regarding a bird burnt offering. The Sages debate whether this term compares it to an animal sin offering or a bird sin offering, detailing the exact procedural laws they share. This very debate serves as the foundation for the conflicting views of the rabbis and Rabbi Elazar b'Rabbi Shimon regarding whether the two simanim must be severed completely.