What happens at the beginning of the chapter that becomes a turning point for Ben? Whay? Chapter 11&12

I think you might consider the brawl is between Brian and his rival Deutsch. Principal Owens breaks up the fight and drags Brian to his office. As he leaves, Brian yells The Wave slogans. Laurie wonders if the fight is about The Wave, but David explains to her that the boys have been rivals for a long time. David adds that Deutsch is one of the few students who has not joined The Wave. “If he was in The Wave,” David says, “he wouldn’t be trying to steal Brian’s position. That guy’s a real detriment to the team.”