He could've left without another word, could've kept the mask intact and gone to silence, to his room until later. Then she touched him, though; just a light touch on the shoulder. Still, it was wholly unexpected, a figurative curveball crashing through Wu's world.
It only showed in his momentary pause, in the slight turn of his head towards Carmel as she spoke, and for a fleeting moment? Wu smiled, heedless of how unfamiliar it even felt. "Room twenty-three, should you ever need me," he said in kind, hesitating again as if there might be more to say, but walking off without saying it. What was happening?