When entering a house occupied by a Visitor, it`s always best to get in quick. That`s one of the first rules you learn. Never hesitate, never linger on the threshold. Why? Because, for those few seconds, it`s not too late. You stand there in the doorway with the fresh air on your back and the darkness up ahead, and you`d be an idiot if you didn`t want to turn and run. And as soon as you acknowledge that, your willpower starts draining away through your boots, and the terror starts building in your chest, and bang, that`s it - you`re compromised before you begin.