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They missed a chance to move further ahead of Chicago after their worst period of the season.

“We just weren’t good enough defensively,” center Matt Duchene said. “It is disappointing. This was a big game for us.”

Mitchell, who signed a three-year extension a few hours before the game, gave Colorado a 1-0 lead at 12:25 of the first period. Winnik tied it early in the second.

McGinn gave the Avalanche a 2-1 lead before the Ducks broke out their offense.

McGinn and Landeskog scored 38 seconds apart late in the second to cut the deficit to 5-4, but Anaheim’s Mathieu Perreault made it 6-4 with a redirection past goalie Jean-Sebastien Giguere 30 seconds later.

Tempers were raised throughout the third period. Colorado defenseman Erik Johnson was given a match penalty for a cross-check on Perreault at 2:07, and things flared up after Nathan MacKinnon had a goal disallowed because of a high stick.

Players from both teams pushed and shoved in front of the benches, and after things settled down Avalanche enforcer Patrick Bordeleau reached across the partition between the benches to push Anaheim’s Patrick Maroon.

Both players were ejected.

It was reminiscent of opening night when Roy took exception to a hit on MacKinnon late in the Avalanche’s 6-1 win. He slammed the glass between the benches while shouting at Boudreau.

Roy was fined $10,000 by the NHL for his actions.

“I learned my lesson,” Roy said. “I was quiet.”

NOTES: The Avalanche signed Mitchell to a three-year extension and G Reto Berra to a three-year contract. Both deals run through the 2016-17 season. … Lovejoy returned to the lineup after missing Wednesday’s game with the flu. … Colorado C Paul Stastny missed his third straight game because of a back injury. He is day-to-day. … Anaheim D Cam Fowler sustained a lower-body injury in the second period and didn’t return.