When Hermione is in the bathroom crying because of Ron and Harry (during the Halloween scene) the mountain troll enters the bathroom and she runs and hides in one of the stalls. Well, the troll takes his club and knocks down all of the stalls. Then the camera goes to Hermione laying on the floor and then back to the troll, who once again takes out the same bathroom stalls that he had just taken out two minutes before hand. Now I know that Hogwarts is a magic school, but why would it replace all but one of the stalls back to new again?