User blog comment:Miskos3/Fairy Tail 519: Show Me Your Smile, Review/@comment-4933386-20170128060031/@comment-7418318-20170128082322

Come to think of it, it's actually more Wendy's kill than Erza's. Well... not really kill since that strike only reverted her to Human shape, but you get my drift.

Sure Erza provided the mechanical part, but it was still Wendy's magic that cut through Irene's defense.