Group Thriller Sequence Development 2

We started by deciding that filming a large group of teenagers, for the party scene, will be very challenging even if we are permitted to do so. Instead, we began thinking of different substitute ideas. We thought that it would be very effective to start in the bedroom, where the song "September" is playing loudly through the hi-fi. There is a clear contrast between the two sides of the room. One is warm and bright and mature, with a cool-kid character (victim) dancing around to the song.

On the other side, it is dark and cold, where the mentally unstable boy is sitting and staring at the blank wall. 
We get close-ups of the victim, even though the audience doesn't know his role in the sequence, but they can recognise him if they were to see him murdered later in the scene.