quoting meficat:

I must admit it looks good.

quoting meficat:

Note: Oxygen is not flammable — it is comburent (oxidizing), it's like a yang for the flammable materials' yin. You can't burn oxygen, but you can burn with oxygen.

quoting meficat:

Can another forms of rock (like sand or glass) be manipulated?

Could they control the air in another person's lungs? (Like in Butcher's Codex Alera.)