User blog comment:Wrath022/Chapter 516: The Truth About Enchantment, Review/@comment-24546844-20161227201713/@comment-29693708-20161229155642

@nick

I'd imagine the reason Irene was taking so long to remove Fairy Heart and could take Wendy's body so quickly is experience. If the sword girls are any thing to go by Irene has a lot of experience with enchanting minds. Fairy heart however is unique and there likely isn't anything like it in the rest of the FT verse; an analogy that springs to mind is a human bomb disposal expert being tasked with disarming an alien bomb.