He smiles, because part of him does find it funny, in the same way that anything horrific has an undertone of the darkly amusing.

"Funny, ah? At least that way we can pretend the only mask is physical."

The truly monstrous reality as he leaves his hand to be played with like a bone, is how faces are their own masks, public to private, and internal to external. Visions of subtlety indeed, Lady Spina, Lady Wen, and Wei Wuxian.

"As it is, Lady Spina, I won't continue to occupy your time. You've been more gracious." He has a cold bed to go crawl into, it's going to be great.