Board Thread:Speculation House/@comment-24718692-20140322030224/@comment-28277272-20140328160307

When explaining to Jaune what aura is, I believe Pyrrha mentions "all of our tools and equipments are conduits for aura". Just like wands in Harry Potter, it would be a way to center and control aura more easily. If my guess is right, and semblances are indeed linked to auras, it would explain why Weiss cannot use her glyphs as efficiently without Myrtenaster. Even though glyphs do not involve Dust (this is just a speculation), the weapon still helps her.

But from what I've seen, Ruby isn't fast on distances. She is just fast to propel herself from one point to another, a bit like Blake. I don't think Ruby would be really fast if you asked her to run a straight line. But she is indeed the fastest one in a fight, along with Blake.