User blog comment:Demetri Anacona/Dust: How it can be used as well as the different kinds/@comment-10380701-20140112020719

Incidentally enough, according to the DVD commentary, Dust ARE bullets. Ruby apparently uses Dust ammunition. But those are "uneducated" usage of Dust.

Contrast with Weiss, who uses Dust in conjuction with her Glyphs to create various effects.