James isn't sure he can manage to be friends with the kid with Kitty's face. Like he's not sure he could ever manage to be friends with Misty, if she somehow managed to appear on this train.

But he knows if he doesn't at least try, Kitty and Soldat both will be upset. He can feel the latter hovering behind his eyes and trying to keep their fretting private. So he sighs just a little and says, "Not sure how often you'll see me, but I won't say no."