"Revelio," Airi said, watching carefully for any sign of activity from the desk, but there was nothing, absolutely nothing. It didn't move, and the text remained the same, no secret compartments came shooting out to reveal a list of instructions, nothing! "It has to be something to do with the blackboard... Why else would he draw attention to it," Airi said, thoughtfully biting her lip. She just needed to think....

The professor had talked about humility... He wanted them to humble themselves, how could they do that? What associated itself with being humble.. Kindness, modesty.. Honesty..

HONESTY! Cavendish had said the truth would set them free after all, maybe they (she and Victor) had to tell the truth? But about what? It wasn't like they were hiding anything from the Professor.

"Actually, I think I figured it out," Airi said, turning slightly to Victor who was... Playing with a rubix cube? And he was acting like SHE was being unhelpful? Whatever. "I think... He wants us to... Tell the truth... I just don't know what about," Airi added, frowning slightly as she turned back to the blackboard.