You were in class, when suddenly, a school wide announcement screeches over the speakers in the classrom;

"WE ARE GOING INTO A LOCKDOWN. THIS IS NOT A DRILL. WE ARE GOING INTO A LOCKDOWN."

Everyone frantically hides while the teacher turns the lights off with a fearful expression on her face. Loud footsteps are heard. The window is broken by an elbow of a man in a black robe. He opens the door as the teacher prepares to hit him with a chair...