"Are you... asking me to prove who I am? After I just handed you your wand?" he asked. He'd already been told off by her earlier in the journals for apparently not reading her mind. He folded his arms over his chest. "I know a lot more about me than you do, so I'm not sure how I'd really go about proving it." He noticed that she was bleeding from the forehead, but as she had a wand pointed at him, he wasn't about to approach.
He remembered having his identity questioned before, the night six other people polyjuiced themselves to look like him. He was beginning to think he should just shave his head to be on the safe side. "What happened to your head?" he asked, pointing at the trickle of blood.