Board Thread:Speculation House/@comment-16348034-20130823234203/@comment-3146930-20130824183730

Aura seems more like a skill, as Pyrrha said that you needed to practice. I'm sure that students trying to become Hunters are forced to take a class in the basics, we have seen other people choose different paths. I mean Weiss seems to rely heavily on Dust for almost all forms of combat, so she may not know how to use Aura properly.

Also, I doubt her cloak uses Dust as Ruby seems to know little about it when she first met Weiss. However I do think that Ruby's speed is a result of her Aura, she most likely only knows enough about it to use for speed or she doesn't know she is using it.