All the "scientific knowledge" Charles had learned in his life couldn't account for such a grotesque physical transformation, so he had to attribute it to the "magic" of this world.
He had tried seven or eight times to transform from his fleshly form into Blood Flame and back again, which allowed him to improve his "proficiency." He could now change forms within seconds. In his Blood Flame state, he was immune to most physical attacks and could float hither and thither, which marginally qualified as a Flight Technique.
Limited by the fact that Charles was still only "Fourth Order," the flight speed of the Blood Flame was not fast, barely faster than an ordinary person running, and he could not gain much altitude; floating to the ceiling was already somewhat strenuous.
However, his body could change shape, which meant he could pass through many places ordinary people couldn't, so at least he wouldn't have to worry about being locked up in a dungeon anymore.
