Surprise does cross Xion's face before her noticeable lack of discomfort, which probably means there isn't anything wrong; in fact, the look she shares with Roxas suggests some kind of familiarity. Skulduggery can't help briefly wondering what that's about; then he consciously puts it aside in favour of faint gratitude and moves on.

"Yes," he answers, bowing his head. "Anything you can tell me, or anything that stuck out. How many were there?"

The number of muggers seems to change drastically between encounters, and if there's a pattern there, Skulduggery intends to find it.