He doesn't look too perplexed about that explanation. He's met people who have come from different worlds before, after all, and the bronze dragonflight is capable of traveling through time so he can accept time passing differently in other place as well.

He takes the offered hand and gives it a polite shake. "Nice to meet you too, Yayoi. I've never heard of a world called Earth before, I'm sorry. My world is called Azeroth. There... doesn't happen to be an easy way to get back to where we came from, is there?"