User blog comment:Darkcloud1111/Good Idea, Bad Idea~Extracurricular/@comment-5217560-20140902153852/@comment-161.38.221.220-20140903192906

^^^ I concur. Just how did they deduce that her Semblance was polarity? It could have been some other psionic power. Either that wasn't the only instance that Mercury and Emerald was paying attention to, and so concluded her ability to be that, or they're that good. Oooooorrr just lazy writing.