User blog comment:Jkphantom9/Volume 3 Episode 12 FINALE Preview/@comment-25436196-20160211013936

So, Yang's arm is actually bleeding. I wonder if this means her Aura was completely depleted by Adam's attack and the glow was just a side-effect of his slash, like I originally thought.

Of course, there could still be another possibility: if we stick to the idea that Adam can somehow bypass a person's protective barrier, it could be possible that a person has to remain conscious for their Aura's passive abilities to work. In Heroes and Monsters, Yang's arm stops glowing right before she hits the ground, at which point she had completely passed out. It could be that her Aura was trying to stop the bleeding, but stopped working when she lost her consciousness, and her arm only started bleeding at that point. Honestly, I'd accept any of the possibilities