[So there's something off with him; he can tell as much. Sometimes it pays off to have lived for a very long time: you get to know yourself very well. He is going to find out what it is.
But taking a moment to check up on her... it's little effort, and it makes for good rapport-building.]
Pardon me, Your Highness. [He doesn't touch her (you don't touch royalty without permission, after all) but makes a gesture to indicate he'll steady her - if she needs and allows it.]