It wasn't Maddy's actions which triggered the thundering, wide-eyed GASP which came from Shimmer. That wasn't even the reason why Shimmer had suddenly begun to flap her hands like an over-excited seagull, only to cover her sternum.
"You...! I...! Am... Mostly certainly not! I a-a-a-am a functional... Hu... Human-shaped person! Look! Look, I-I-I can..." Reaching quickly, Shimmer stuffed at least five cheesesticks into her mouth and defiantly snapped and chewed, trying to make a show of it, for Maddy's viewing stake. "I can eat stuff! A ball of light would just... Like... Float or something! A-a-and even if I was, I... Well, I'm not! I'm very not! Nope-nope-nope!"