He can not leave.

"To the best of my ability, I will see that your request is met. However, I must insist that you do not leave tonight. If you are caught sinking around the castle, my hand will be ****, and I will have to imprison not only you but also your daughters as spies. Tomorrow morning I will announce that you were here in secret to discuss a debt relieve plan. After that, you may take your leave."

King Thomas is about ready to speak but is interrupted a knock on the door and the voice of his daughter, Princess Albertine "My king you called"

You look at King Thomas and whisper, "It will be awkward if she sees you, so I must request that you hide."