[ WELCOME ROOMIE, time to get out of the dumps... except, not really. Shit is horrible here. His request for clarification is greeted with a sigh. Things weren't ever simple - ]

Either or. If we're put out, I doubt we're going to wake by normal means. Could just narrow down where the killer came from - if he kills again. If we rig doors with alarms, we can see if one of them have been disrupted - narrows down the field a bit, don't you think?