How to introduce my antagonist?

[alen]

I'm currently creating an original screenplay, and i've rewritten it many times but i have not yet gotten to a scene where my antagonist enters his home (he is a schizophrenic, who murdered his family, friends and a local police officer) and he finds 7 group of friends (one was killed outside getting beer for his friends inside) smoking, drinking and ruining his old abandonment home. He has blood on his hands from killing the other teenager, the scene is cutting back and forth between the protagonist (Michael) and his girlfriend (Carissa) in the back yard arguing. And the other characters (Andrew, Amelia, Alex, Robby) are looking for the other character (Hunter) who just went missing. It keeps cutting back and forth, and speeds up faster every cut, till it introduces the killer. I'm not sure how he should be introduced though, through his perspective, him standing there looking at everyone with his bloody hands and everyone in shock? I'm not sure, what would frighten you more?