Colorado made it a one-goal game on Mikko Rantanen's power-play tally at 8:47 of the second and carried that momentum into the final 20 minutes. Matt Calvert tied things at 3 just 2:11 into the third, opening the floodgates for the Avs, who went on to score three more times, the latter two on the power play (Nathan MacKinnon at 9:02; Tyson Jost at 15:39; and Alexander Kerfoot at 19:45).
"Listen, I thought the second period if we got through that…there were some tough stretches, we got caught in our own end, we had to ice pucks, matchups went their way….some of it was self-inflicted," said Bruins coach Bruce Cassidy. "We're gonna talk about being down guys on the back end, of course that effects our hockey club.
"But some of those mistakes we could have helped ourselves. You need saves in those situations. Pucks were going through Jaro [Halak] tonight. We gave him a lead and that's where you hope he comes through for you when you're down guys as well.
"It certainly wasn't a shooting barrage out there tonight. We did a pretty good job of one-and-done, it's just those odd-man rushes against good players cost us and it usually will."
The Bruins also lost the battle of the first lines, as Colorado's top trio of Gabriel Landeskog, Rantanen, and MacKinnon chipped in a goal apiece and combined for 6 points. Boston's top line of Pastrnak (goal, assist), Bergeron (assist), and Brad Marchand teamed up for 3 points.
"They were matched up against a very good line that controls puck possession. They attack well," said Cassidy. "So I think it was a good matchup, it's been well talked about…there's probably a half dozen lines in the league that people talk about being the best in the league and they saw one tonight…at the end of the day their line came through for them in the third period and they get the win."