"Several reasons," Arthur said, straightening with sudden iron in his spine. "None of which you would understand."
He turned his chin abruptly away from her, but he didn't move. "To address your claims, I'm again going to insist there is only one me in any space, and the me that's at this point in time dictates what the future me will be; I'm only one person. The right can't exist, because it never existed, because I turned left."