Board Thread:Speculation House/@comment-25713341-20140905032400/@comment-3146930-20140908222623

Cinder's Glyph in her battle seemed to completely incinerate the debris Glynda was using, burning it to ashes. I would assume she only uses the fire-Dust in her outfit to either amplify her powers or because it uses less energy to use Dust when compared to Semblance.