Gurianov made it 2-0 on the penalty shot with 1:11 remaining in the second after being interfered with by Montreal forward Nick Suzuki on a breakaway.
"To be honest, I didn't think about anything," Gurianov said when asked about the penalty shot. "It was after a long shift, so I was gassed and couldn't even think. I just went there, saw the five-hole, shot there, and scored."
Gurianov scored his second of the game on the power play off a pass from Roope Hintz at 10:43 of the third period for a 3-0 lead. It was his second multigoal game in the NHL (Oct. 6 against Detroit Red Wings).
"[Gurianov] has been stepping up," Stars defenseman Esa Lindell said. "He's got huge speed and he's using it. He's getting chances every game, and now he's burying those. I think when I first got up (to the NHL), it just took time to get used to it and be yourself here. Maybe you're nervous in the first few games, but that's normal. It takes time."
Heiskanen scored an empty-net goal from the right face-off circle in the Dallas zone at 15:08 with Price pulled for an extra attacker to make it 4-0.
"Right through the whole game, they were on it," Canadiens defenseman Ben Chiarot said. "They were quick, stronger on the puck, stronger in battles, just a sharper team. They were a better team, that's all it was. It wasn't starts or finishes. It was straight through the puck drop right to the end."
Lehkonen scored with 3:42 remaining to make it 4-1.
"You get some nights that no matter what, you just can't seem to find your legs," Julien said. "Our game is based on that. Our game is based on our speed, our execution, how fast we play. We didn't even get close to that."
The Stars went 5-for-5 on the penalty kill and allowed five shots while shorthanded.
"Everybody on the penalty kill tonight was huge and was probably the difference in the game," Bishop said. "[Assistant coach Rick Bowness] did a great job of preparing us there, and the guys did a great job of executing."
