User blog comment:Hidden Scorpius XI/An ever-present detail/@comment-3146930-20150120213220/@comment-3146930-20150121231705

@DiegoAnime3000: I thought Weiss summarized it pretty well when Pyrrha first uses her Semblance.

"No, you dunce! It means she has control over magnetism."

Short, not so sweet, but it describes her power pretty well. I think the only reason the "contact theory" became a thing was because of Mercury's misguided analysis of her ability that seems to contradict everything that came before it.