The verbal altercation appeared to set Deslauriers off and he challenged Kastelic to a fight. After escaping the grasp of the linesman, Deslauriers and Kastelic squared off against the boards by the penalty boxes with Deslauriers landing a few shots on Kastelic as the linesmen attempted to break the fight up.
It's certainly not something that you see everyday, and I can't remember the last time a player fought twice during the same stoppage in play, but it would not be surprising to see the Department of Player Safety fine Deslaurier and Kastelic, which would be stupid.