[He's okay with her not being able to figure him out a bit. He isn't actually that calm at all - he's scared, but struggling to keep it hidden as best he can, because that seems to be a strategy that works.
She wants to get him upset, so he won't give her the satisfaction. Getting angry won't help him, so maybe being calm will.
As the silence draws out, he decides to try another tack]
no subject
She wants to get him upset, so he won't give her the satisfaction. Getting angry won't help him, so maybe being calm will.
As the silence draws out, he decides to try another tack]
Let me ask you a question, Empress...
What are you getting out of this?