But the Bruins are the NHL's top team for a reason, and they weren't going quietly.
Bergeron made it a 3-2 game with his second of the night at 6:13, Again, it was Pastrnak's point blast that caromed hard off the end boards, and Bergeron was there - stationed at the side of the net - to shovel it home, short side, on the forehand.
The B's rounded out the scoring with the tying marker at 12:21, as Charlie Coyle took off on a breakaway and showed great hands with a fake shot, leg kick, and a smooth wedge over Talbot's glove hand.
A wild first period finished with the Bruins leading 12-6 on the shot clock.
Brad Marchand gave the visitors their first lead of the night less than a minute into the second. Parked in front of the net and locked in a battle with Rasmus Andersson, Marchand was able to free his twig at the most opportune time, redirecting a Brandon Carlo shot past Talbot.
With the Flames in need of a spark, Matthew Tkachuk stepped up and dropped the mitts with Jeremy Lauzon in response to a hard hit on Mangiapane moments earlier. Tkachuk got the better of the Bruin with a series of left-hand jersey jabs, and even connected with a few stiff rights before the two combatants tumbled to the ice.
Lauzon was left bloodied, while Tkachuk got a hearty cheer from the Scotiabank Saddledome faithful.
It was a quiet third period, despite a valiant push from the homeside. Calgary's best opportunities came on a powerplay midway through, but dog-tired Bruins found a way to keep the homeside at bay before Bergeron exited the penalty box and silenced the pressure.