Early in the third period with the New York Rangers down by a goal a scrum began. The scrum involved Rangers forward Chris Kreider and Panthers forward Matthew Tkachuk. As the two players were trash talking back and forth Matthew Tkachuk's mouthguard fell on the ice. A few seconds later Chris Kreider picked up the mouthguard and chucked it into the crowd.
With this action, Chris Kreider broke a rule that should have led to an ejection from the referees immediately. The rules state that players are not allowed to throw any other object or piece of equipment out of the playing area.