User blog comment:Tsubori/Ren no-sells a snake/@comment-11109699-20130824202453/@comment-205.251.233.52-20150605225935

Ruby has said that Yang can take multiple hits, and every hit seems to charge her up more. What I got from that, is that she absorbs the energy from such hits, and uses them against whatever enemy she may be facing. I think Ren's semblance works in a similar way. Especially seeing as we see Ren break the fang off the snake, stab it in the eye, and use some sort of aura/martial arts combo to exlode the snake's head.