Crawford's bigger than a couple of hallways. The walkers would probably lose interest some time after they got back(during the medicine part) and wander off to roam the halls. Then Ben happens upon the door looking for a tool for their only (seemingly)safe exit, sees no walkers, wasn't there when they first attacked so he doesn't know they're nearby, and so he takes it. Then the bell(not sure what else) draws the walkers back to the door to bust through.
|