Xiao's brows furrow at the realization that you know who he is. He's not used to being seen as a well-known Adeptus. It's not a bad thing, necessarily, he's glad he can help people. But people knowing him for his powers and not who he is, can get slightly wearing.

That aside, Xiao frowned at you. "You know me? Who are you? I don't remember ever seeing you here in Liyue." He crossed his arms as his golden eyes roamed around your body, as if he was judging your whole existence.