She turns, giving a yawn as she glances between the two chaos marines (and also notes the location of their tail. "Grandpaaa. This is boring." Katria pouts, glancing down the corridor in the opposite direction to the serf. "I'm gonna find something more fun to do."
She turns to amble off and steps around a corner, stopping as soon as she's out of sight. Concealing herself within her cloak, she doubles back, picking out a course to ambush the watcher with a wide grin.
Stealth! Target 120. (1d100)