When Regina is finally made aware of Cady's treachery, she retaliates by spreading the contents of the Burn Book all over the school, quickly inciting massive socially motivated brawls throughout the halls. To avoid suspicion, Regina inserts a fake libel of herself in the book in order to blame Cady, Gretchen, and Karen – the only female juniors not mentioned in the book. Karen convinces the school's principal, Ron Duvall, that they did not write the book, who soon quells the fighting and gathers all of the junior girls in the gymnasium. Math teacher Ms. Norbury makes the girls face the ways they all treat each other and apologize to each other and the teachers; the plan sees success, as friendships are rekindled. When Janis' turn comes, she defies Norbury, confessing her plan to destroy Regina with Cady's help and openly mocking Regina, drawing praise from other students Regina bullied. Pursued by an apologetic Cady, Regina storms out of the school and is struck by a school bus, breaking her spine, and rumors spread that Cady pushed Regina in front of the bus.