Board Thread:Speculation House/@comment-27143816-20160216033644/@comment-26397825-20160307064913

Jaune's semblance is a force field that is capable of redirecting or reflecting attacks back at the person who tried to attack him. This was confirmed in the V1 Director's Commentary, described as 'a force field' by Miles, Kerry and Monty, and was shown in the scene when Cardin tries to punch Jaune but is thrown back after a bright flash of light.

It's not a time changing or destiny changing semblance. It's a force field, or a mirror shield if you will, stronger than the normal protective abilities aura gives you.