Board Thread:Speculation House/@comment-10380701-20141011082048/@comment-24994749-20141012051512

Yeah, I thought that to, but then Monty made that twit calling it semblance so...

Semblances seem to be part hereditary (going but what the crew said at the livestream) + part what defines the individual (going by what Blake said of her problems with confrontations and her shadows in the last episode).

So, maybe the whole emiting fire when you power up is a family thing (hence the Burning Heart emblem and the surname being Xiao Long) and the powering up from damage is particular for Yang?