פירוש על שבת 13:1

1. When Trapping an Animal Is Forbidden on Shabbos and When It Is Permitted, 12 Seifim: 1. A person who traps a sparrow in a cabinet into which it flew, and other birds, and a deer in a house or a roofed coop and they are trapped in there, is liable. If it is not trapped in there, one is exempt, although it is forbidden.

5. If a deer entered a house and a person bars the way, he is liable. If two people bar the way, they are exempt. If one person is incapable of barring the way and two people bar the way they are both liable. RAMA: If the door is already shut it is permitted to lock it. [R"an; the Maggid]

6. If a person is filling the doorway, another person is permitted to sit beside him, even if eventually the first person gets up and leaves; the second person is not liable, rather he is permitted to do so; however the first person is liable.