User blog comment:IamJakuhoRaikoben/Chapter 323: The Shadow That Comes And Goes, Review./@comment-4489126-20130315165506/@comment-4829046-20130316044838

"stating that she will never forgive him, but that she will pardon him for the sake of Erza and his friends."

Isn't that a reference to Familiar of Zero? One of the supporting cast says pretty much the exact same thing.