Board Thread:General Discussion/@comment-96.233.74.45-20140413040730/@comment-3146930-20140426193043

Caliburdeath wrote: Of course, it's only been shown once, and even that could simply be a particularily strong aura barrier.

They mention in the commentary that the scene with Cardin punching him is a hint to Jaune's Semblance, but as you said we have only seen it once. These two things together could just mean that Jaune's Semblance only appeared instinctively at a low level to protect him and the true form of his Semblance hasn't yet appeared. So for example, if someone had a Semblance that allowed them to make fire, on instinct sparks or embers may appear if they are excited or not paying attention. However when controlling their Semblance, they could make columns of towering fire.