Late in the third period, Keller drove towards the net with the puck. He lost the puck while tied up with the Shark's defenceman. Keller then caught an edge and fell awkwardly into the boards. Right away all players around Keller who saw what happened stopped skating and waved for medical staff. They rushed to the the ice to tend to the Coyotes forward. The medical staff then right away called for the stretcher.