He stayed just where he was. "I know you could," he said. "But do you think I would let you? Do you think I have so little regard for you that I would stand back and let you do something you've already asked me not to let you do? The only reason I trust myself with this, Doc, is because I know - from you - how bad it could be. That I'm not capable of making those decisions."
He shook his head, but picked up his shirt and shield. The uniform was still back in his room somewhere in the belly of the TARDIS, but he didn't care about it that much. He had others.
He moved past her, respectfully keeping out of reach. "I know what kind of person you are, Doc. You have rules. I'm sorry I let you come so close to breaking one, but I would never stand by and let it happen. Once I get this thing safely squared away... I hope I'll see you again." He paused at the door for a moment. "I owe Rory some vintage action figures. Maybe you can get them to him."
He could only hope, hope, hope that there was a way for that to happen.