What are peter’s feelings of anger and frustration?

Since Cole went as far as smashing his head repeatedly against the sidewalk, Peter's injuries have left him with a speech problem and vivid nightmares. He is shy, quiet, and terrified of Cole's presence after that moment forward. He too harbors anger, but it is directed against Cole. Much like Cole Peter is lost in a sea of anger and resentment. He cannot move forward until he comes to terms with his own feelings.