Nie Huaisang smiles - and those who know him would realize it's one of his more devious looks, the kind he gets when he's scheming - from behind his fan.

"There's Daoist magic, of course! I can disguise myself to look like you, and you could disguise yourself to look like me."

Of course he doesn't know how to do this off the top of his head, but there's the famed Cloud Recesses library somewhere around here!