Board Thread:Speculation House/@comment-6500074-20130829103240/@comment-4010415-20131209050625

It seems to me, just from observation, that Weiss has to make specific hand movements in order to make a glyph. Ever notice that she moves her hand a certain way whenever she makes a glyph, as if she's casting a spell? That's one of the reasons we used to think she was using dust to make glyphs. We thought she was reaching to Myrtenaster and sprinkling dust, but really, she was waving her hand to "cast" it.

When she helped Ruby take down the giant Nevermore in Players & Pieces, she displayed some pretty obvious hand movements, as well.