User blog comment:IamJakuhoRaikoben/Chapter 444: Emperor Spriggan, Review./@comment-5268982-20150715132559

Before Erza revealed Brandish' Magic, I had my own theory. I thought she had some kind of Mime Magic that allowed her to use people's Magic against them (that's how she made her underling "disappear"). Shrinking or making things bigger sounds boring :P