"There's always those games where the puck finds you, and this was one of them," said Khaira, who made it 3-0 with his fifth goal at 1:11 of the second period.
"He's using his body, he's moving more, he's skating with the puck, he's confident in those areas around the net and he's getting rewarded for it," Lucic said. "It's great to see a guy like him step up and provide us with some much-needed offense and hopefully he can continue that."
Leon Draisaitl got his 100th NHL assist on Lucic's goal, which made it 4-0.
Galchenyuk scored on the power play at 13:44 of the second to make it 4-1.
Klefbom's power-play goal made it 5-1 at 2:39 of the third period, and Auvitu made it 6-1 when he finished off a passing play with McDavid and Jesse Puljujarvi 40 seconds later at 3:09.
It was the 11th time this season that Montreal has allowed two goals within a minute.
Danault made it 6-2 at 15:58.