"Eep!" The child visbly pales for a second before regaining his composure.

"Watch how you speak to a Guardian Spirit! Emperor or not, you are but a mortal woman!"

He winces again when she asks him about his connection to Medea.

"I am a great and mighty Guardian Spirit! And as for my relationship with Medea, I hold a contract with that woman and shall be severely displeased if she is threatened in anyway."

It is obvious that he is trying to hide something.