User blog comment:Doc Hamme/Those EYES...../@comment-3146930-20140728032218

That sound actually appears twice in the episode, once when Cinder first appears and again when she is touching Roman. I think it is just music to imply that Cinder is scary. Roman makes that sound of frustration probably because he wants answers, but knows he can't get any because Cinder would blow him up. It would be like your boss telling you to do something, but wouldn't tell you why. As a result, you wonder what the meaning of your tasks are.

So far all her abilities seem to be fire related and I believe that her dress glows because those spirals are actually some for of Dust that activates when she is about to blow stuff up. Her Semblance also seems to be based around fire, as during her battle with Glynda she creates rings of Glyphs that incinerate the debris Glynda was controlling. I don't think she has any more slots in her move-pool for mind control as well.