Board Thread:Speculation House/@comment-14138255-20140829002738/@comment-3387274-20140830062636

Thing is, that semblance description is itself, skewed. Pyrha has absolutely no hesitation in revealing her semblance to those who watch; She pulls her weapons around with it almost constantly, and in ways that make it fairly obvious. And that's aside from the fact that she quite happily tells Ruby and Weiss what it is and used it openly in the food fight.

In short, Pyrha isn't hiding her semblance at all. That's merely Cinder's perception of things. The fact that Mercury need only watch one fight with Pyrha, and then try to kick her a few times and he knows exactly what her power is should have made it obvious there wasn't much concealment there.

Of course, while it still stands that she keeps foes who don't know at a disadvantage, this kinda only applies to foes who don't pay attention to her movements, which is rather poor practice for fighting a champion. I think a more likely reason why she doesen't do anything too dramatic with it is because it would be way too much of a game breaker if she did. disarming an opponent with a wave of your hand makes a fight very one sided indeed.