She confirmed without a doubt that the cards were supernatural, something that no character should reasonably put any stock into, unless you are meta gaming. Not everyone immediately thinks "MAGIC!" when they hear of a murder with no confirmed cause of death.
Now you have one more shred of evidence to help convince people like Klive and another couple of important characters you have yet to meet that myths are involved and you are that much more likely to get them to help you, or in Klives case get xem to cooperate more.
Unlike Tomas I'm trying to be more covert with usable information, there's always a method to the madness. The only time you can expect easy info is if you beat someone in a duel or if you collect a number card and get some izanami lore.
And might I add whilst it occurs to me, I'm debating implementing a bit more of a failure state similar to Aftermath so that there's a penalty for not achieving much.
If anyones thinking this topic was a waste of time btw, each of you have several pieces of a puzzle to get closer to a Number holder, you're just not putting them together. I might recommend Omega and Turbo stick around and talk to their classmates, you might get some idea of what Charles has been up to...