  Harry pressed up against the wall waiting for two Prefects to move. At the moment the two Ravenclaw Prefects wouldn't move from the damn entrance of the Astronomy Tower. He regretted using it now, maybe he should have picked somewhere else. He could, possibly, disillusion himself and sneak past them but ultimately he wasn't about to risk his First year spell against two Fifth years who were looking for disillusioned people. Finally they left and Harry was about to move before he felt a hand tap his shoulder. He knew who it was before he turned around.