One evening, when detention was one hour away from it's end, the teacher had a terrible tummy ache. He locked the students in the classroom, worried that they might escape while he was in the toilet. But it was a terrible mistake. While he was in the toilet, he slipped and knocked his head on he basin, knocking him out. When it around seven, the time when the school closes, a guard found him lying in a pool of blood in the toilet. Quickly, they sent him to the hospital and locked up the school.

That is, not knowing the students were locked in the detention room. And soon, it was one hell of a night in school.