Why does Roy's suspension get lifted? What does Roy think the real reason is?

Roy's suspension is lifted because his mother is proactive in his defense and determined that the two boys be punished equally for fighting. As it stood, Roy was suspended from taking the school bus, and the boy who started the fight was not. None-the-less, Roy believes his mother's actions were a direct result of a desire to return to her yoga class, which she could not attend because it directly conflicted with having to drive Roy to school.