Hayley tucked a strand of hair behind her ear with her free hand and looked sideways at Gabe. "Since we're being, you know, off-topic," she said. "You know a fair bit about dark magic, don't you." (She didn't bother raising her tone to make it a question; his was one of the thickest files she had in her bag.) "Any theories on how someone could manage to turn your house elves into zombies in the first place? Spell, curse, wrong kind of food?"