User blog comment:IamJakuhoRaikoben/Chapter 431 & 432: My sword is... & Brair in Love, Review./@comment-1776824-20150428200536/@comment-1776824-20150428202532

Even if it was meant to be some sort of "in your face" comment, Erza having a sword that gives her that ability wouldn't be too out of her realm of possibility at this point.