His expression doesn't change, much, when his rescuer rambles about the resemblance Vax'ildan has to the woman in the painting. Of course, but how does this person know Vax? Percy waits for the man to collect himself as much as he can.

"How do you know him?"

His attention is briefly interrupted as other people try to get closer to the table. Percival moves, but returns his focus to this man who apparently knows his brother-in-law. And who might pass out if any more blood rushes to his face.