Frost coach Ken Klee felt Minnesota played two games on Sunday in Boston. In the first game, the Frost played well. In the second, well, not so good.

And the second game carried the most weight.

Minnesota controlled play for the first period and a half Sunday, building a 2-0 lead, only to have Boston dominate the latter half of the contest. The Fleet scored the game’s final four goals en route to a 4-2 victory.

Kendall Coyne Schofield and Brooke McQuigge both scored within a two-minute span late in the first period to put the Frost on top 2-0. That’s where the score stood until Jill Saulnier got the Fleet on the board midway through the second.

It was all Boston from there.

“We couldn’t get our energy back, and they get a soft bounce off one of our players for a two on one,” Klee told reporters. “(The Fleet) played hard, I think their penalty kill got them some more energy — they had more chances than we did on the power play. Hockey is a momentum game. When you have it, it’s great. When you lose it, it’s tough to get it back.”

Susanna Tapani tied the game early in the third period. Hilary Knight put the Fleet on top with more than six minutes to play in regulation, and Alina Müller’s empty-net goal with nine ticks to play put the contest on ice.

Klara Peslarova came on in relief in net for Boston to open the second period, and didn’t surrender a goal the rest of the way while stopping 15 shots.

The Frost have now dropped all three games since returning from International Break, with the latter two losses coming in regulation.

Minnesota next plays Tuesday in Montreal.

“We have to be better. We have to play better. We have to play for a full 60 minutes,” Klee said. “We can’t play a half game and expect to get points. This league is too good, it’s too hard, and we just have to find a way to be better in the full 60.”