Just moments after Sean Kuraly had tied the game, 4-4, with his first goal of the season at 3:03 of the third period, Boston appeared to take its first lead of the night thanks to some strong work from the Charlie Coyle line.
Coyle carried the puck into the zone (more on that in a minute) and worked it down low with linemates Anders Bjork and Zach Senyshyn, who was recalled from Providence before the game. Senyshyn eventually picked up a loose below the goal line and fed Coyle out front for what looked like the go-ahead tally.
But Montreal coach Claude Julien opted to challenge, and after a lengthy review it was determined that the puck - by a millimeter - had crossed the Habs' blue line just before Coyle's right skate.
"Some are gonna go your way, some aren't - ours are not going our way lately, but I assume they will straighten out over the course of time," said Bruins coach Bruce Cassidy, whose team battled back from deficits of 3-1 and 4-3 to tie the game. "But the rule was put in place specifically for egregious plays. They're over there for three minutes. You think, well, what is the purpose of this rule? Either you find something or you don't.
"Three minutes, so now you're looking for something. You know it's gonna go the other way and it did. That's where my beef comes from. You always want to get it right, but there was a change this summer to punish the coaches for this reason. They didn't want three-minute reviews. Any way, it was a big part of the game. Didn't go our way."
Montreal responded a few moments later with the eventual winner, when Ben Chiarot beat Tuukka Rask with a wrister off the netminder's glove to make it 5-4 with 10:54 remaining.
"For me it was [a tough night]," said Rask, who stopped 26 of 31 shots and saw his season-opening point streak end at eight games (7-1-1). "It was one of those nights it felt like it was a golf ball, not a hockey puck. Wasn't tracking it well. Tough night for me, but I thought we battled well. Could've easily won the game."