They used magic earlier than expected. To be fair, they didn't tell them that it was prohibited. West and the others just assumed that magic would be the last thing in their mind since there were humans with them, just as they had expected Evelina to not tell the new recruits who she really was.
"So Freeda is a witch of Luna," Leila said, nodding her head. "I was asking it before, but the only thing she told me was that she serves the light. I should've known by then."
"I feel like they didn't trust us, though," Hellen sighed. Her voice was soft, making sure that they wouldn't be heard from the back. "I mean, we should've provided it if they needed light, right? That's why we're there as their coaches?"