User blog comment:Eres - Mistress of Illusions/Questions on Dust/@comment-11866075-20131213195715/@comment-15145664-20131213211508

I'm basing the Black theory off of Weiss' black glyphing holding Ruby in place in Ep. 8 and partly Pyrrha's semblance. But, Ruby's gravity rounds in the red trailer might break the idea depending on what they actually do.

And the White theory is also from Weiss' glyphs being able to increase her speed and power, pushing if you will. And her finishing move could just be augmented by a strong outward force, so this one seems more likely to me.