Board Thread:Speculation House/@comment-74.97.16.55-20170806201653/@comment-4010415-20170806203217

As for the "fire", there's a theory that the bright orange Dust that's sewn into her clothes is actually lava Dust, which is why

1. The projectile that Glynda blocked in the pilot splattered onto the ground as if it was liquid.

2. Cinder was able to make obsidian (black volcanic glass) weapons in Dance Dance Infiltration.

We saw bright orange Dust crystals in the volcanic biome in the tournament, and that biome had lava geysers.

So, she may have mainly been using lava, not fire.