How does Jason meet Charlie?

Just when Hawthorn thinks he will go completely stir crazy, he hears shouts. Seven or eight man burst into the cabin carrying a twelve-year-old boy. The boy is seriously injured. It is decided that the boy's leg must be amputated. Hawthorn cannot stand the thought of it and leaves the cabin before it is done. Hawthorn hears the boy's screams and imagines that it is much like the sounds one hears during a war.