The Bruins' special teams carried the day as the power play converted on both of its opportunities, while the penalty kill went a perfect 3-for-3, all during an 8:19 stretch of the first period.
"We have a lot of confidence in our penalty kill," said Montgomery. "I think our special teams won the game. Our power play was 2 for 2, our penalty kill was 3 for 3…great work by both coaches [Joe Sacco on the PK] and [John Gruden on the PP]."
After killing off three consecutive Blues' power plays over the first half of the opening period, the Bruins cashed in on their first man advantage with 6:26 left in the first when DeBrusk buried David Pastrnak's backhand feed from the doorstep.
"I think it did [give us momentum]," DeBrusk said of the penalty kills. "Any time we get kills like that, especially in order - it seemed like we were in the box there for the first little bit - there's no rhythm or timing for multiple guys in the game, so it's one of those things you just try to do the job and kill the penalty. And to be able to get one on the power play right after was a good way to set the tone for our game.
"You always want to be a difference maker on special teams, and it was nice to kind of get some greasy ones there and also some of the plays we were making. It was nice and good timing for sure."
Boston cashed in on the power play, once again, midway through the third period as Bergeron tallied the winner from his patented bumper position with a quick snapshot off a nifty saucer feed from Brad Marchand with 7:15 remaining.
"We liked our power play in the last couple of games. We generated a lot of chances, we haven't really had the finish, and tonight we got the finish," said Montgomery. "The desperation and the work to get the second- and third-effort chances in the offensive zone, I think, really paid off on both of those goals."