I think when someone doesn't act calm someone or something will get hurt or killed. for example when charlie killed Pete van horn. this tells me that he was not calm because before he pulled the trigger the boy yelled " it's the monster! its the monster!" and then charlie shot Pete. Another piece evidence that when charlie shot Pete every started to make suggestions that charlie was the monster and when backed up to his porch someone thew a rock at charlie and broke one of the windows and cut charlie.