Megatron continued to walk through the cooridores, slamming open doors and searching for people. Find the target, and use a hostage to make him do what needed to be done, that was his plan. A few doors down, he found a room that contained a speaker for the PA system. He didn't know that himself, but he recognized the microphone. He observed it, and in a few seconds guessed how it worked. He pressed a button, and spoke, "Testing" he said, and heard his voice broadcast across the school. Excellent, this would work perfectly. "Attention members of this facility" he said into the mic, "you are now under Decepticon control, any attempts at escape will be detected, and the perpetrators will be shot" he shouted the last part, emphasizing his will.