Board Thread:Speculation House/@comment-190.47.114.141-20170910035917/@comment-27684451-20171009014536

I think we get a HUGE hint from the story of Joan of Arc. As stated by SpiritedDreaming,  during this   scene in the directors commentary, they say that it's the first signs of Jaune's semblance.

Here's where the Joan of Arc trivia comes in.

Joan of Arc apparently started having "visions" at age 12-13. She said that these visions were often acompanied by a bright light and she would here the voices more distinctly when bells were ringing.

Also, Joan of Arc was never in any actual fights, she just gave out the orders, so I don't think Jaune's semblance will be related to fighting. My guess is it will be related in some way to the visions or voices. If you look at the scene in question, just before the punch, Jaune seems to be looking at something other than Cardin and he chuckles to himself.

That's all I got though. I can't really think of anything that could indicate anything more specific, like why Cardin hurt his hand when he hit Jaune.