It was Boston's first tally since early in the first period when Pastrnak snapped his own five-game goal drought 5:59 into the game. After pressure from Patrice Bergeron along the boards led to a Calgary turnover, Pastrnak scooped up the loose puck and ripped a shot short side on Rittich to give the Bruins a 1-0 lead.
"It feels good. Every time you get back on the board it's nice," said Pastrnak. "Overall, it's 2 points we got and that's most important…great bounce back for us."
That it was. A game after allowing six goals, the Bruins limited Calgary to 29 shots - with just 12 coming over the game's first 40 minutes. The Flames' tallied their lone goal with Matthew Tkachuk's power-play marker at 5:28 of the second.
"We were real good defensively, even the third for the most part," said Cassidy. "We had a few turnovers and they pushed. We got pucks into the middle of the ice towards our net. It was a good response from what we saw the other night and the last few games, where we were much more responsible."
When the chances did come - Calgary fired 17 shots on Rask during the third period and overtime - Rask was there to lock things down.
"Just stay patient. There's gonna be chances in the OT, try to stay big and focused and hope that the puck hits you and today it did," said Rask. "Very good, very good [defensively]. They pushed hard in the third there, the second part, for sure. But we handled it and got a nice breakaway goal in the overtime."