Cressida and Leon
It wasn't long into working with John and seeing how much he clung to his magic that Cressida knew how important magic was to John, and a more recent conversation made the depth of that being what he saw as his chief and only talent more apparent. She didn't agree. John had admirable traits and she was sure if he sought other subjects with even an once of the same vigor as he did magic, he would (at the very least) receive passing marks.
"I don't know," Cressida said, "But I fear that it might be the case. He displays some of the symptoms. I need to be sure but the best way to get the answer would also be the best way to have John completely isolate himself." Hydra were protective of their personal space and especially their privacy. For the most part. There was the occasional Hydra who left a door open to let everyone know what they were doing because it was enough to keep the others out.
"It's been some time since I was a student and I could use the insight on what would be the best way to confirm whether or not he is without the most abrasive of fallouts."