John's initial confusion is a bit disarming, only more so when he explains himself. Does he expect Martin to have reverted physically in addition to having his memory altered? That seems considerably more far-fetched than all the rest, and yet his surprise is so matter-of-fact, Martin's not sure what to think.

The explanation for the scar itself is little better, though it does take immediate precedence. "Attacked?" he repeats. "You mean here? By what?" The next question is already forming before he can stop himself, though he hesitates slightly, awkward and uncertain. "Is that... is that the same thing that... did all that to you?"

Not particularly graceful, and he winces immediately. "S-sorry, I just... you look... like a lot's happened." Right, because that's so much better.