Juraj Slafkovsky is continuing to learn new lessons everyday as an NHL rookie. This week's lesson is don't hit an opposing team's player from behind. In last nights 3-2 victory over the Detroit Red Wings, Slafkovsky was ejected for hitting from behind. Detroit forward Matt Luff was trying to control the puck in the neutral zone by the side boards. With all his attention focused on a bouncing puck his back was towards Slafkovsky. Juraj then hit Luff from behind as he went face first into the boards. Luff remained on the ice in discomfort and bleeding from his face. Meanwhile, a crowd of Detroit Red Wings came to his defense. After a brief scrum, Luff left the ice and went immediately to the dressing room. Poor Matt Luff. He took a slap in the face against Minnesota and now this.