"Oh." It's one of those ohs, the sympathetic tone a person shares usually with condolences when someone mentions something like, war orphan. And on top of the image already painted of the guy's world, from the rather ordinary and idyllic fishing port town to a landscape threatened by fiends from the moon.

But Tidus knows there's nothing he can really say that would mean anything, so he's not going to tack on those condolences: the guy's grown up in this world, what does he need them for?, and moves on, instead. "Well, I talked to a woman who says she's some kind of space soldier where everyone lives in giant ships. I dunno if I'd want to guess anyone as normal here."