Board Thread:Speculation House/@comment-27404492-20170417075739/@comment-26018514-20170508080727

PisceanWaterbender wrote:...

Another possibility...perhaps if you're put under extreme circumstances or stress, your Aura (even if it was depleted) could activate momentarily at a crucial moment, such as with Ren (would've likely died), or with Blake / Yang (who also would've died). I mean, Aura is one's Soul...having enough gusto to do something dangerous certainly warrants a temporary fix.

Alternatively... maybe M & K were saying that Adam was able to 1 shot pierce their Aura, not deplete it... So their Aura went down temporarily and they suffered from the damage, but they still had enough to use it, just they were suffering from shock and it was not enough to particularly matter.