"... Did it taste bad?" Cake asked in a stage-whisper to his brother, ever aware of how Nike didn't seem to like the eating-of-the-chalk (which was weird, because he was doing it, but you didn't argue with a Sora), shuffling closer to the shapeshifter after the whack. See, this was why you asked first.
But then Nike's request-- and it was a request- hit Anti, and the so-called Keyblade Master snapped to attention, raking his mind for an answer. Shadow Portals never seemed to work in this world... There wasn't a door... They needed a door- "Just gotta make a door." Hah, thought to word. That was nice. Another moment to think, and, "How strong's the wall?" His smile melted into a neutral expression, a bit of a frown at the edge. Nike and X obviously didn't like the room, even if Cake wouldn't mind sticking around and sleeping or something- so they... needed... an exit.
Another glance at the last piece left, sitting in Nike's hand. A repeat: "Wha' c'n chalk do, in makin' a way out?"