Sleepaway Camp had me on my knees when I first watched it. Seeing Angela rise from the ground naked and growling, akin to a caveman, face frozen in terror much like mine was. What’s it all about? People are still asking that question, even after all these years. I can only give my opinion.
I would say that Peter went “kennel crazy”. Only instead of being locked away in a kennel for his entire life, he was locked away in his own mind. Think about it. It’s not that hard to understand. Put yourself in his shoes. What if what happened to him happened to you. You would go mad too. His open mouth growl and frozen face was the first time he had the chance to express himself, as Peter. Just as he had done with the killings..