Sixteen-year-old Beatrice Prior belongs to the Abnegation faction, but altruism has never come naturally to her. When they have to take the aptitude test to see which faction they will live in for the rest of their lives. His test turns out to be inconclusive. Shows the same aptitudes as Abnegation, Erudite, and Dauntless. On Choice Day he decides to join the Dauntless. After Tris jumps into the pit and onto the net, Four's hand is the one she grabs and he pulls her out of the pit. He is later revealed to be the instructor of the Dauntless transfer initiates. On the first day of training, Quattro demonstrates the Dauntless transfer fighting technique. He also shows transfer initiates how to shoot a gun. Four teaches them and also shows them how to fight. While walking around, observing the initiates, Four approaches Tris and examines her, saying, "You don't have much muscle, so it's best to use your knees and elbows." To become a member you have to be brave, that's why they have to go through 3 stages. Four had said: “Fear doesn't turn you off; wakes you up. I saw it. It's fascinating...