Why is Paul called into the principal's office the Monday after his trip to the carnival and what does Paul do?

Paul is in class when he's called to the principal's office. There, he finds that several members of the soccer team are already present and that the school officials are questioning them about their time at the carnival over the weekend. Paul learns that some boys with a soccer ball destroyed an exhibit at the carnival. Paul almost immediately realizes that it was the group from Tangerine Middle School and when pressed, he shares that information.