LAS VEGAS — That’s all she wrote, folks.

The Avalanche went from top of the world one week to swept from the Stanley Cup playoffs as the Vegas Golden Knights stunned Colorado with a 2-1 win in Game 4 to complete a four-game sweep in the Western Conference finals. Vegas will face the Carolina-Montreal winner in the Stanley Cup final.

Here are three takeaways from an ugly end to Colorado’s season:

Brutal first period

You’d think the Avalanche would have come out with their hair on fire, playing like their season depended on it, because it did. Instead, they came out flat, sloppy and had one decent offensive chance in the first period, a breakaway off the stick of Brock Nelson that went into Carter Hart’s glove. Beyond that, they were bad. The only reason they were able to exit the first trailing 1-0 was because of the spectacular play of goaltender Mackenzie Blackwood.

The Avalanche had not lost four straight games in regulation in over a year. They lost four straight games in regulation in this series.

“I didn’t think we’d win four straight on these guys,” Vegas captain Mark Stone said on the ESPN broadcast.

Blackwood starts in goal

There’s a solid argument to be made that Blackwood should have started Game 3, but Jared Bednar turned to him for Game 4. Blackwood was the least of Colorado’s problems.

Mark Stone, the slowest player on the ice, sneaking behind Colorado’s defense was the only blemish on Blackwood’s record through two periods. His best moments came in the second period when he robbed Vegas sniper Pavel Dorofeyev not once, but twice, on a Golden Knights power play. One came off Blackwood sprawling to his right. The second one came with him pushing the opposite direction, snagging Dorofeyev’s shot with his glove.

He gave his team a chance to stay in the game when there’s an argument to be made they shouldn’t have. The Avalanche didn’t help him enough.

Where did the offense go?

The highest-scoring team in the NHL could not buy a goal in Game 4. Not only that, but they could barely generate anything dangerous on offense at even strength. The power play that seemed to turn things around after the Olympics break hit a wall in the Western Conference finals while facing the best penalty kill in the playoffs. Often times, they killed any and all momentum the Avalanche had created.

A lot went wrong this series for Colorado, an understatement given they were swept. But the high-flying offense falling flat on its face at the most important time of the season must be the biggest disappointment. Trailing in the third, the Avalanche created next to nothing, going down without so much as a fight until they finally pulled their goalie.