In reply to FeelingFeline
Deathstalkers are pretty damn stupidly strong. Unless Jaune's shield is made of Vibranium I seriously doubt it would have stood up to a direct hit from a Deathstalker without crumbling, not to mention Jaune himself not getting tossed away like a ragdoll. I mean he was already healing himself with Aura seconds after Pyrrha activated it for him so it just seems simpler to assume that her method of unlocking Aura helped him figure out the gist for the most basic applications of Aura than it is to assume that he had Aura but never actually used it until the Forever Falls incident, despite all the other situations he ended up in where he displayed superhuman attributes. Just surviving the Deathstalker catapult seems like something that should have required Aura.
Also I'm pretty sure the writers have stated somewhere that the incident with Cardin was a hint at what his Semblance in, though I admit I'm not 100% sure on that. It seems fairly logical to me though, that scene was played up far to much to waste it on Jaune figuring out how to do a thing that we were already assuming he could do. And the writers had a pretty consistent artistic style for extra focused on Force-Fields Aura back then, it was a colored circle around the area that got struck, both Ren and Cinder displayed the same effects so it makes little sense to change it for Jaune. The writing was a bit spotty back then but I don't think they would screw up something as basic as having consistent effects in order to let the audience recognize what's happening, at least not for a pivotal scene like that.
Anyway, Semblance Ideas....
When the user is struck by an attack from an opponent which drains their aura they are able to create a connection between their Aura and their opponents, symbolized by a glowing string of energy flowing between them. After the string has been created whenever the user's Aura is drained by attacks they can mitigate a portion of the cost by transferring it to their opponent. An attack that would drain 10% of their Aura instead only drains 9% while the person they are linked with has their Aura drained by 1%. The user can link with up to 5 Aura using opponents at a time, each additional Karma Link mitigates another percentage of damage.
Not sure if this is a bit underpowered but I was worried about the Semblance being OP if it transferred to much damage. I wanted it to be something that gives an edge rather than something that lets the user win fights just by sandbagging.