How did Bryon cope with Charlie's death?

In Chapter 5, Bryon and Mark get themselves into trouble after they hustle a couple of guys from Texas in several games of pool. Fortunately, Charlie saves them by pointing a sawed-off shotgun at the Texans. While Charlie, Bryon, and Mark are walking away, the Texans shoot and kill Charlie. After Charlie's death, Bryon is devastated and feels guilty for hustling the Texans, which caused the conflict. Bryon mentions that he would only speak to Cathy and Mark about what happened. Bryon then becomes introverted and starts acting differently. He mentions that he failed chemistry and attempts to talk to Mark about the incident. However, Mark doesn't understand the significance of their decision to dismiss Charlie's warnings and simply believes that "things happen." Instead of continuing to talk to Mark about Charlie's death, Bryon copes with the tragedy by speaking to Cathy about it.