User blog comment:Zolnir/Cinder Fall (Part Two)/@comment-9090085-20140607040312/@comment-11188061-20140607085901

This is baseless, but I have always assumed that Cinder's flames are a parting gift from a dying friend, who imparted their soul to Cinder during their last breath. On the other hand, it doesn't quite fit what we see right now... well, like I say, I went through this section pretty quickly because of its vagueness.