Harry nodded a little, waiting until Remus had taken up a fighting stance. He went over in his head the things that he'd learned from Sirius, step by step what to do and how to land an effective punch. Then, for some reason, his mind went back to the conversation he'd had with Remus and Sirius the night they'd told him about the Class, and how Remus had told him he was acting like a moron, and the like. Suddenly he didn't find it so hard to do this, and swung hard, putting force into the punch aimed at Remus' side but keeping his balance at the same time.