High School Revenge - Evil Girl

We have been sat down discussing a final story for the project, where we have decided that the girls possession is actually a force coming into the School, which is a result of her angst towards the bullies. The girl is locked away somewhere in the School and later in the film the only way to stop the problems is by rescuing her. Here is a perfect video that shows a way we could depict the moment that shows the girls "dark side" kicking in.