This is a reference back to the last panel of Strip #318, when Aylia noticed one of her books of potions was missing, right after X created a magical explosion . . . it works even if you don't remember the exact moment she took the book of potions, though (grin). Poor Aylia, unable to keep her roommates from borrowing books from the library that . . . isn't rightfully hers to begin with . . . well, all right, she probably deserves what she gets, in this case!
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