Board Thread:Speculation House/@comment-14138255-20151213162620/@comment-24147441-20151225055156

Yes, its been confirmed. If you look on the Dust article on this wiki, you'll find it listed, and then links to the sources that confirm it. Ruby wasn't the one using the gravity dust, that was Weiss. She made a path of glyphs up the cliffside and combined them with gravity dust to help Ruby run that angle. The recoil of Cresent Rose was giving her extra speed and power, and in addition to that she was using her semblance.