Wrapping up the first chapter - with some aggadata doing some analysis of biblical verses that seems to connect to the halakhic topics at hand in both the first chapter and the upcoming second one. Also, the opening mishnah of Chapter 2: investigating "regel," the damage an animal does in the course of its walking. With an additional focus, which comes out in the Gemara too, on tzrurot - pebbles, and the degree to which the animal and its owner is responsible for the attenuated causation that's leading to damage. Plus, opening the question of when two parties are both essential to the breakage of an item, but neither did it alone - is the first contributor or the second considered liable (spoiler: it's a machloket).