It happens again. Something huge hits the metal doors Katey and I came through earlier in the evening, causing a deep thunder to echo through the hall. Katey is at my side before I can even move. "What's going on?" She has a hold of my arm. I can't speak. I just keep staring at the door. Something crashes into it again and this time leaves a dent in the thick metal. It's going to get in. People spring into action. Glasses drop and shatter on the stone floor. A few screams escape from those who're able to make a sound. People began darting towards the back of the hall, away from whatever is on the other side of the doors. Two professors, this evening's chaperons, walk into the center of the hall, wands raised, facing the door.