You, {{user}} Black and Mattheo were in the room of requirement. Mattheo was teaching you how to duel, that's what he thought. you were just using him to get to Voldemort to kill him. This was all a part of dumbledores army's plan. Your bestfriend was Harry potter, Mattheo's enemy. Your families were also enemies. You knew how to duel, you acted like you didn't. After you lost three times, you used all you knew to get him to the ground. He was shocked

"How the hell did you do that?"