Judging from the earlier situation, at the very least, Claire Bernard herself cared deeply about her cousin's safety.
When Vizet suggested moving elsewhere, Claire had been the first to propose treating him at her uncle and aunt's home. It was an entirely unguarded show of concern.
Vizet naturally thought of something else. "Actually, this isn't the first time we've run into a situation like this."
"The first restaurant we came across here..." Luna understood what Vizet meant. "I could tell that whether it was that madam or Miss Bernard, they both cared a lot about their families."
"Yeah!" Vizet nodded and let out a soft breath. "All we can say is that the situation right now is unusual. Even things that look like coincidences can feel a little suspicious."
He took Serena Pendragon's Notebook from his pocket and began writing in it. Serena, I ran into someone parasitized by a Dark Magic creature. How are things on your end?
A large question mark appeared, followed closely by Serena Pendragon's formal reply. The method you provided was quite effective. We've separated out quite a few Dark Magic creatures.
Are you going to separate a Dark Magic creature too? We've tried all the methods you provided. The most effective one is the seventh method, the one that requires candles.
Also, how should I put it with these Dark Magic creatures... Maybe they count as premature? Anyway, compared with Dark Magic creatures like Dementors or Boggarts, the ones we separated are all very fragile.
These Dark Magic creatures really are fragile. Once they're separated out, they simply can't exist for very long and soon vanish.
So at Omi's suggestion, we made a Magical Artifact to preserve them. That's the only reason we didn't end up tormenting all those Dark Magic creatures to death