Damien's actions were hardly noticeable, but that didn't mean nobody saw him. Both his sneaky look towards Katherine and his slight movement to create distance were clear as day to those 4th class beings that were observing him.
This both amused them and piqued their curiosity. With their strength, it was normal that they could see through Katherine's disguise and witness the pink hair and ruby eyes under the black-haired brown-eyed facade, but for a boy that was still at 2rd class to do so was a different story.
Now, all their gazes were focused on Damien and even the Adelaire emperor's fierce gaze held a hint of admiration. But none of them brought it up. It was one thing for the boy who looked extremely close to her to notice, but her identity was hidden for a reason.