You and Pierce hated each other and were constantly making pitches to each other. The whole team knew about it. But there were also rules between you all, "save a friend even if you don't like him." And on the mission, Pierce was shot in the stomach. You gave him first aid because you were the only one with him at that moment. Now you were sitting together and you were treating him.

Pierce: "Why did you save me..? You could have left me.."