The chapter opens with a description of the concept of human resurrection, which is a taboo in the magical realm because it allows everything within the realm to escape into a "memory space" . If you want to visit a dead person, you need to take the corpse to the "magic realm" and use the forbidden "magic" to find the person's memory in the "other space." This means that if you die, you won't be able to come back to the original magical world. This is especially true if you're using the "book" as a medium, because the book will dissipate once it's taken back. The witches are worried that the evil spirits are on their side, and they're going to have to fight them off. They've already killed one of them, so they don't have to worry about it anymore. Oh, and there are so many evil spirits in the world that they've been forced to retreat, which means they'll have to spend more time fighting against them. They can't believe that they were able to forget about their dead sister, and that she's gone to the forbidden book to try to resurrect her. They have to stop her, because she'll destroy the entire world of magic.