They were left with a dual state of mind. On the one hand, they had discovered a lot, and had probably gotten closer to the truth than almost every witch or wizard, save the brown-haired wizard and You-Don't-Know-Who. On the other hand, they had neither been able to find a cure for Mr. Grithe's sickness, nor had they gotten a single opportunity to thwart the retching-inducing designs of You-Don't-Know-Who. For a start, they didn't even have a real name for him. They now had a new mindset when it came to the Intuition Potion : it was not that much a potion that would bring you any knowledge you would need, but more of a beverage that would give you a swath of relevant knowledge. One last bit of action took place around this time. The honeymoon between Filch and Peeves would have to be postponed. For Filch had found the purported stack of books that Peeves had collected. But whenever Filch would open one of these books, some acid glue-like liquid would come out of the book, and fly at amazing speed towards Filch's face. Filch tried to duck the nasty weapon, but the latter was behaving very much like a guided missile, and would never, ever, miss Filch's face. Filch tried every book, hoping that the perilous books were decoys for one of them, that would be worthwhile. But in the end, it was obvious that the whole pile of books had been made harmful. Filch ended up visiting Mrs. Pomfresh. And the students were able to conclude that Peeves had stolen vials from Professor Snape's office, and normal-looking books from other places, to set up this final trap, after having planted a false feeling of confidence in Filch.