Bryon begins the process of growing up in earnest here. He knows that if he’d heeded Charlie’s advice and hadn’t hustled the Texans, Charlie would not have been killed. As such, Bryon begins to feel guilty and takes responsibility for what happened. Mark, on the other hand, denies any fault on their part, reflecting his refusal to grow up in the same way. That Bryon also receives Charlie’s car reinforces his newfound maturity, as it symbolizes Bryon’s increasing responsibility.