Board Thread:Speculation House/@comment-27276671-20160214220907/@comment-26397825-20160714210824

Hmmm. The only 'dark and light' things I found in relation to Aura in that episode are these:

Pyrrha: No. (switching back to Ren as he leaps out of the way, the snake's mouth hitting the ground and instantly coming up again to hit a jumping Ren back with its snout) ''The monsters we fight lack a soul. They are creatures of Grimm, the manifestation of anonymity.'Ren lands in a crouch when the serpent encircles him again, and he unleashes his StormFlower before jumping up and firing at the creature'') They are the darkness, and we are the light.

In that sentence, she is not saying there is dark and light aura. She is saying the Grimm, which lack a soul and therefore aura, are the darkness, and the people, who have a soul and therefore aura, are the light. No dark aura whatsoever.

Pyrrha (off-screen): It's not about why; it's about knowing. (the snake flows around Ren and tries to bite him again, but he flips over it and drives his weapons into its head, pausing a moment without sensing serpent's white head behind him) Understanding dark and light helps us manifest our Aura. Everyone has some of both.

This sounds more Yin and Yang than literal dark aura, to be honest. She's talking about knowing why they fight the Grimm and knowing yourself. It's a philosophical thing; it sounds more metaphorical than literal.

And lets be honest; Jaune wouldn't have the foggiest about the 'dark and light' she talks about, yet he can still use his aura and have it unlocked. So big points towards it being metaphorical.