[him not knowing isn't much of a surprise, given that they didn't exactly sit down and get to know each other when they met, and even after he was shipped off for a few nights in jail.
He was an only child, though, so he can't even imagine how that would feel - let alone a twin. There isn't much he could say that would be close to comforting, but he still puts an arm around him]
I'm sorry she disappeared. [geez, he can't even picture traveling Teyvat to look for anyone, either. But if he were in that position, he'd probably do the same] You'll find here again, though - whether it's here or back in Teyvat.
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He was an only child, though, so he can't even imagine how that would feel - let alone a twin. There isn't much he could say that would be close to comforting, but he still puts an arm around him]
I'm sorry she disappeared. [geez, he can't even picture traveling Teyvat to look for anyone, either. But if he were in that position, he'd probably do the same] You'll find here again, though - whether it's here or back in Teyvat.