[ The symbolism is indeed lost on him, but not just because he doesn't know. It's also just that he doesn't want to think about it - it's not the major concern here. The major concern is that Rei has this, and the way she shivers when he touches her tattoo. His hands aren't painfully cold or anything, he's pretty sure of that, so it's because of the tattoo being touched? If it's nothing regular, if it's something that only appears when touched by something not human..

.. it just.. doesn't sit right with him. Something about it just doesn't feel good, despite the fact that she hasn't told everything about it to him yet. It's just like instinct, like some feeling that breeds in the pit of his stomach as he stares at the blue, slowly pulling back his hand and letting out a sigh. ]

C'mon, Rei.. no matter what it's about, don't say something like "I didn't think it'd matter". [ It's not like he wants to pry, per se, since Shinpachi does respect people having things they'd rather not talk about. But he at least wants to make sure she knows, because he's entirely sure Rei isn't the sort of person who's used to talking about stuff in general.

Her tries to catch her gaze the best he can. ]

Like I've said.. we're friends. That means you can talk to me 'bout anything. Even if it's something like this I may not fully get or whatever.. when you have friends, you don't have to deal with stuff by yourself, y'know?