The fact that her Grimoire was itself magic and seemed to have some kind of sentience did not surprise Belladonna in the slightest. It was a little unexpected, for sure, but it was a magic book given to her by a mystical wizard.
If it was just a regular book, then that would have been the most surprising thing of all.
Upon discovering the true magic nature of it, she couldn't help but perform a few tests. She let it go, only for it to float in the air where she had been holding it, and she could make it disappear or reappear with a dramatic flair of her hand.
Granted it was only disappearing back into her Bottomless Bag, but really the ability to conjured a floating book with a snap of her fingers was so quintessential to the image of a true mystical mage that it was too good to pass up. Even if her fighting style was absolutely nothing like a true mage in the slightest, but that was beside the point.
