Victor returned with a small mirror, about the size of a sheet of paper. The Doctor stepped back, just in case, and angled the mirror so Jon could see himself...
He recognized the face in the mirror. It was...his best friend, Karyn Black. He looked down...and saw...well, he wasn't a he.
"You've been here since the accident." the Doctor said, calmly. "You couldn't deal with the fact the real Jon was gone. But then, you started to...edit them. You changed details. You added elements, like a magical wishing rock, so that you could have a way to explain changing your life. But it is all in your head."
All in his head? That couldn't be. Jon stared at him. Then something else struck him. "What accident?"