The nearby Formal Wizards, upon hearing Lucien's explanation, were first stunned before they realized Carly had another identity apart from being a Wizard Apprentice—she was a Pureblood Fairy.
Mainly because in the recent battle, besides the two Moon Blades, Carly barely used any fairy-related Bloodline combat techniques, relying more on potions and Witch Tools for defense and retaliation, her style more akin to that of a pure Wizard.
It was only after Lucien's clarification that the other Formal Wizards somewhat belatedly remembered Carly's identity as a Pureblood Fairy. Then, like a group of gamblers who had glimpsed a sliver of hope in their despair, they eagerly turned their anxious and hopeful gazes towards the images in the observation mirror.
Although they hadn't "invested" in Carly, at this moment, they sincerely and firmly hoped Carly could defeat, or even kill, Beckett, the Heart of Electromagnetism.