Board Thread:General Discussion/@comment-203.129.23.222-20130906131117/@comment-10390252-20140829084228

 Calling It Now: 

His Semblance will be healing. It will be the deal-breaker when Cinder and her forces attack Beacon during the dance.

I'm betting that needle has a drug on it that blocks use of Semblance and she's going to use it on all those at Beacon who she thinks are reliant on it to fight (that's the list they're compiling). When Pyrrha goes down, the shock unlocks Jaune's semblance and he immediately heals the taint from everyone, turning the tables on the bad guys.