Board Thread:General Discussion/@comment-27596920-20141205004927/@comment-4010415-20141218024344

People can control what Dust does when they use it. That's what he meant. If Yang was using Dust to produce fire from her hair, she would be able to control the fire because it would be from fire Dust.

Hell, Cinder uses fire Dust, and she can do a lot with it, even controlling it from a distance.