It's the first time the Canadiens have faced significant adversity in three weeks, when they fell behind 3-1 in the Stanley Cup First Round with a 4-0 loss to the Toronto Maple Leafs in Game 4 on May 25.
Montreal will have the chance to respond when it plays Game 2 of the best-of-7 series at Vegas on Wednesday (9 p.m. ET; NBCSN, CBC, SN, TVAS).
"(There are) things we can get better at and work on," forward Cole Caufield said. "Yeah, we'll be ready for Wednesday. "We'll just have to be ready to bring more energy and more focus."
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Caufield was a bright spot for the Canadiens in Game 1, scoring his first Stanley Cup Playoff goal at 12:05 of the second period on the power play to cut it to 2-1. The 20-year-old rookie called the moment "special" with his parents in attendance.
Another bright spot the Canadiens are hoping to carry over the rest of the series was their start. They had the better scoring chances in the first period, when they outshot the Golden Knights 12-8, but fell behind 1-0 on a goal by defenseman Shea Theodore at 9:15.
The goal marked the first time Montreal had trailed in 447:08 dating to Game 4 against the Maple Leafs. It is the second-longest streak in NHL playoff history, behind the streak of 488:38 for the Canadiens in 1960.
"I thought it was a great start," said Carey Price, who made 26 saves. "I thought we came out firing, obviously. They got the momentum going into the second period, but I thought that our first period showed that we can play with them."