Marco is right, Kai doesn't like that at all. He tightens his lips, pursing them into a frown and glances over at the brownies to see if they've settled down yet, if he can call this job complete.

"I don't think I know that." Which is either a way to say that he doesn't care, or expressing his genuine ignorance about all things which are elfin customs - especially the sort that they don't talk to humans about.