Carcillio was upset that Bernier was throwing with his stick up, and rightfully so. However, he was plain stupid for getting involved as the third man. Not so much a fight as JR keeping Carcillio from getting free shots on a guy who was already engaged with someone else.
It is true that Bernier is throwing with his stick up (idiot), but if you notice Yandle of the Coyotes also has his stick up throughout much of the early altercation, so Coyotes fans should probably shut up. Carcillo is an idiot, and usually ends up on the business end of someone else's fists. Maybe jumping someone from behind will improve his win-loss stats.