User blog comment:B214/Chapter 482 review/@comment-4933386-20160418125104/@comment-5303512-20160418130029

She had Conqueror Haki!!! XD but in all seriousness, it must be related to this Eileen person Neinhart mentioned.

Well, they are the strongest enemies that Erza ever fought so wouldn't be surprising that she had difficulty despite her year of training.

That is the issue with some villains in this series, or other series for that matter, they just torture their enemies because their sick sadistic bastards.