User blog comment:Darkcloud1111/RWBY Commentary Information/@comment-25713341-20131124202251/@comment-3146930-20131125111428

That is pretty weird now that I rewatch the episode. He has a black eye, then Cardin punches him and a bright light appears. After that, his eye is completely healed and all is well. Then after the fight, the black eye is back.

Based on this, maybe Jaune's Semblance is temporary invulnerability. He can instantly heal himself and won't be hurt for a short amount of time, but once that time passes all the injuries he received return. So he had a black eye, then his Semblance kicked in and it healed, then after the fight ended his injury returned as his Semblance was no longer in effect. Or it could be a mistake.