He lightly chuckled. He knew that a lot of people were nervous around him and wanted to push things to see if the princess was as well. "May I have this dance, your highness?" Prince Maverick asked quite boldly. Honestly, this purpose would allow him to let his assassin see how the princess moved and how the knight watched. Of course, considering his rank, while she could refuse, he'd purposely asked loudly so a number of the nobles were looking their way. It would make her look bad to refuse the dance. It was exactly why he'd done it- Maverick enjoyed testing, and pushing, and putting people on the spot. It was his nature.
On the other hand, Emilia was focused on keeping up the act of an attendant. At least, her position had the advantage that she could stay relatively still and do little unless Maverick said something about it. She watched with interest from the corner of her eye as the knight moved back to better watch the area. If worse came to worse, if she were close to the princess and he was not, she could kill her before the guard could do something about it, but that would involve exposing herself. So, she'd make it a last resort. She would much rather, though, not have to run for her life once this was done, so doing it in secret would be best.