He doesn't think she'll stab him, either way. Given how they'd left things back home, she might try, but he has faith in his own ability to defend himself. And really, he hadn't needed the explanation, but it's nice to hear the reasoning out loud, to be certain that it's the same as what he'd thought.

He doesn't know quite what to say, so after a moment he just holds out his own arm and pulls up his sleeve to reveal the word "Pasaana." Done the same way, for the same reason.