Board Thread:Speculation House/@comment-85.130.101.225-20130816112245/@comment-24198837-20140508223903

Knowing Jaune's character and fighting style as we've seen it, and how defense-focused he is, maybe his shield has a similar effect to this:

Aura based defense, acting like an amplifier for the ability that Ren and Cinder have been shown to use for protection. Maybe it'll even function like the bubble shield from Halo, except that the power comes from Jaune's soul, not Forerunner tech.