You are working at a summer camp for teenagers, during a flag football a collision. Which teenager should you treat first?

Peter, a 16 year old with a large hematoma on his arm, but the arm has full range of motion.

Davie, a 17 year old with pain in his ankle, unable to bare weight on the ankle

Bobby, a 16 year old with a contusion of his thigh after a game the teenagers had

Ronald, 15 years old with one arm longer than the other, unable to move the arm at the shoulder joint.