User blog comment:Relikz/Chapter 364: Tartarus Arc, Part 1: Immorality and Sinners, Review./@comment-7505640-20131220125754/@comment-4829046-20131220142526

Let's just say that Erza hasn't been "popped" yet, not sure about Mira though.

And No. They are "Test Subjects" or as B4 put it "Lab Rats".