There is always an inherent level of danger for the officials in any hockey game, although it's not overly common to see officials leave a game. It happened Friday night, though in Colorado's 3-2 win over the Arizona Coyotes. Linesman Brad Kovachik took a puck to the back of the head midway through the first period and had to leave the ice. The game went on with two referees and one linesman until he returned in the second period. It wasn't a particularly hard shot, more of an attempt to dump the puck into the offensive zone. However, the puck caught Kovachik right in the spot where the protection from the helmet ends. Check it out: