If one [person] sat in the doorway but did not [fully] block it, [and then] a second [person] sat down and blocked it, the second one is liable. [If] the first [person] sat in the doorway and blocked it [completely], then the second [person] came and sat down alongside him, even though the first [person] stood up and went away, the first [person] is liable and the second [person] is exempt. To what is this [case] analogous? To one who locks his house to safeguard it, and a deer is found to be guarded therein.