Mikko Rantanen fired a shot from distance that deflected off Lehkonen at the net front and a Canadiens' stick to beat Allen. Despite the Avalanche potting another goal, the crowd at Bell Centre cheered as it was Lehkonen who found the back of the net.
The Canadiens - who to this point, had only put up two shots on net - managed to beat Georgiev late in the frame at 18:58. Off a Suzuki faceoff win, the puck spat out to the point to Johnathan Kovacevic, who lofted a shot on net. En route, Anderson batted the puck out of the air which took a fortuitous deflection to beat Georgiev.
The Avalanche didn't relent one bit as the second period ensued and instead scored two goals in the span of two minutes to take a 6-1 lead, which resulted in Montreal Head Coach Martin St. Louis pulling Allen from the pipes in place of Montembeault.
Colorado furthered its lead 5-1 at 1:48 as Compher fired a shot on net from distance. Allen made the initial stop, but Toews swooped in for the rebound and sent the puck to the backdoor for Rodrigues across the slot. The winger passed the puck to the net front where Rantanen tapped in his team-leading 43rd goal of the season.
Two minutes later, Lehkonen sent a pass from the wall into the slot for Nichushkin. The Russian winger stickhanded before sending the puck to the backdoor for Compher to tap it in and end Allen's night in Montreal's net.
Lehkonen left the game in the second period and did not return after sustaining an upper-body injury.
As the second period came to a close, the intensity rose during a scrum between Nathan MacKinnon and Kaiden Guhle after MacKinnon tripped Guhle and was penalized for it and Jack Johnson joined in and he and Guhle were administered matching roughing minors.
On Montreal's power play off a faceoff win from Suzuki, Guarianov beat Georgiev with a lower shot past his pad at 19:18.
Colorado faced a push from the Canadiens, who outshot them 10-8 in the third period and found the back of the net twice, but the Avalanche capitalized twice on the power play during the final frame to help buoy their eventual 8-4 win.
Just under the midway mark of the third period, the Avalanche furthered their score 7-2 on a tremendous power-play goal from MacKinnon, who drew the penalty on Rafael Harvey-Pinard at 8:09. MacKinnon took the puck from the defensive zone, carried it all the way to the offensive zone and beat Montembeault.