... Why would monsters knock, instead of destroying the door? Seems way to gentlemanly. -- Personally thought they were raiders or something.
And yeah, Blue chick seems super dumb, especially for her occupation & situation. Like, the guy, that seems to know a bunch about the current situation, tells her not to open the door, but she does so anyways? Are you shitting me? Tack on she already saw what is happening outside, so why would she think the police would come to her apartment/room? Were there any police cars outside, that would give her that idea? Tack on, how would it be safe to evacuate, especially with all those monsters out there?