User blog comment:Otaku Chick/Otabear's Anime Review: Ep 145/@comment-5263525-20120825212547/@comment-4829046-20120829032917

I think Mashima has something prepared for Erza. She is S-class but so far the only armour she used for fighting and winning against SS-class level mages was her normal cloth-type armour so maybe Mashima has something prepared to show the audience just how powerful she actually is without her regular armour. Mashima DOES degrade the power of his iwn magic y'know. Similar to how if not for the anime, Mira would have had the same freaking take-over until GMG arc.