"Kurama, Yusuke and I can do the majority of that. But it wouldn't hurt to at least know some self-defense, would it?" He did not expect Yukina to turn in to Touya all of a sudden - hell, he wouldn't know the beginning of how to teach her, but something was better than nothing. And she was his sister, so.. of course he was going to at least try to get her to learn something along those lines.

"I don't know, yet." Nor was he going to tell her what to learn, but there is equally no way he is telling her that. It would make his motivations too damn obvious.

"Until we know more about how this place works, it may end up better to lay low."