Shaun walking to his detention

Shaun - I got a detention now so I'll be out later.

Friend on phone - Alright mate. see ya

Shaun enters the room

Shaun - Hi Sir

Mr Oswick - Sit down Shaun

Silence

Mr Oswick - I've just got to go to the staff room to pick something up

Shaun - Alright

Door closes as Oswick walks out, Shaun sits waiting, but then decides to get up and try and leave.

Shaun - The damn doors locked

Shaun pulls harder and harder try to open it, the lights flicker and go out but then come back on. He turns around as there is a sound from behind him, there's a message on the board.

Shaun - oh s***

He tries harder to get out. Amplified sound of foot steps coming up behind him. loud screaming of agony.