The Bruins tied the game, 2-2, with 6:39 remaining when Torey Krug trickled down from the point and slapped David Krejci's feed by Linus Ullmark (35 saves) for his third of the season. But just over three minutes later, Buffalo reclaimed the lead for good on Jeff Skinner's second of the night.
"Those are big moments in games, right after a goal, first and last minute of each period, those are big moments…you can't give up goals and you have to try and keep that momentum and continue to go," said Krug. "It's just unfortunate that we weren't able to keep that momentum and go because I thought we were actually playing pretty well."
Perhaps the game's biggest momentum swing came just moments after the Bruins knotted things at 1 on Steven Kampfer's first tally of the year. Following a scramble in front of Buffalo's net, Brad Marchand appeared to put Boston ahead when he jammed a loose puck over the goal line.
But an early whistle by referee T.J. Luxmore led to a no-goal call on the ice. The officials went to the headset, though it was eventually ruled that the play was not reviewable.
It was the second straight game that the Bruins had a goal negated because of an early whistle by the referee. On Friday night in Pittsburgh, with the puck lying on the chest of Penguins goalie Casey DeSmith, the whistle was blown just before Sean Kuraly knocked it home.
"I think it was a poor call. The puck's visible. We scored the goal. There's no goalie interference," said Cassidy. "At least the other night in Pittsburgh it's on the goalie, you could see where they could lose it. My beef is - you know I'm not a big fan of review - but the reason it's brought in in the first place in any sport is to get the call right.
"I thought there was a clear example of it's a good goal. The puck was never frozen, no goalie interference. You'd hope the get that one right, so for me it's a head scratcher how that one gets off the board especially when the National Hockey League has been preaching how to get goals.
"In September, the video comes out that unless it's something really, really egregious we want to keep the goals. I was very surprised when that one came off the board."