Montreal Canadiens enforcer George Parros sustained a concussion and had to be taken off in a stretcher after he fell face-first onto the ice during a fight with Toronto Maple Leafs brawler Colton Orr in Tuesday night's NHL season opener.

Parros’ injury occurred during the third period of the Canadiens stand against the Maple Leafs, Yahoo Sports reports. Orr had confronted Canadiens player PK Subban, prompting Parros to intervene on his behalf.

Orr, 31, and Parros, 33, squared off for their second fight of the game, with each enforcer throwing wild punches at his opponent. Eventually, Orr slipped and fell to the ice, dragging Parros down with him. Parros fell forward, landed directly on his face, and was knocked unconscious.

Despite the fact that they had fought twice in the Tuesday night’s game, the injury was serious enough that Orr called to the side for help, Yahoo Sports notes. 

In the video, Parros appears to land on his chin. He attempted to climb to his feet after receiving initial medical treatment, but quickly returned to the ice and asked for a stretcher, CBS Sports reports. Parros appeared to be alert as he was stretchered off the ice.

After the game, Sportsnet reporter Christine Simpson provided an update on Parros’ condition. “Habs say George Parros has a concussion but he was alert and conscious when taken to hospital,” Simpson wrote on Twitter.

Parros’ injury highlights the NHL’s concerns regarding the safety of its players during fights. Before this season, the league instituted a new rule that forces players to leave their helmets on during fights. Still, Parros wore his helmet during the fight with Orr and still suffered a serious injury.

Over his nine-year NHL career, Parros has developed a reputation as one of the NHL’s most aggressive players. He has recorded more than 1,000 penalty minutes during his time in the league.

Warning: Graphic footage of Parros' injury can be viewed below.