When all of the Ra Yellow students are entering the Society of Light, Bastion is upset that he isn't already part of the group. He says that since the Society of Light is for the best he should already be a member. Bastion is so upset about the fact that he isn't a member that he goes to the White Dorm to challenge Sartorious. Instead of Bastion dueling Sartorious, Chazz is told to take his place and duel Bastion. (thetvdb.com)