Martinook went to the corner boards to backhand the puck out of his own end. As he tried to backhand the puck his stick broke. He continued to battle for the puck for a moment with Rangers forward 
Mika Zibanejad and then dropped his stick. From the referee's perspective, he apparently did not drop his stick soon enough and a penalty was called. The referee crew even got together to discuss the play and determined it was a penalty. Watch the replay below. Did you think that was a penalty?