2 mishnayot: one on the timing of the court's decision regarding an ox that has killed and might need to be out to death, and how that impacts the value of the carcass. Plus, the 4 guardians (shomerim), and how they undertake the role of the owner. Also, what must one do to guard a mu'ad ox, sufficiently? The only certainty is when the ox has been put to death. But with dispute, of course.