It was a game Boston should have had every reason to win.

First, there was the emotional impact of Zdeno Chara. Although he took a puck to the face about 72 hours earlier that reportedly broke his jaw, Chara still started and was greeted with a standing ovation from his loving fans. Then, there was the fact Boston was at home with a chance to take a decisive 3-2 series lead before heading back to St. Louis.

But after failing to find the back of the net for most of the game and a call that will be dissected ad nauseam, the Bruins found themselves slumping off the ice after St. Louis snuck out of TD Garden with a 2-1 victory and a chance to win the Stanley Cup on their home ice on Sunday.

If you just looked at the box score, Boston looked like the better team. They put 39 shots on goal, compared to St. Louis' 21, and they were consistently on the attack throughout the night. A few close ones missed either by just a hair or were saved at the last possible second.

But close only counts in horseshoes and hand grenades, and although St. Louis didn't look as good as their counterparts offensively, the Blues drew first blood in the second period, thanks to a goal from center Ryan O'Reilly.

The rest of the game was a slugfest back and forth, until a moment in the third, which will likely go down in infamy. As the Blues hunted for a shot, St. Louis center Tyler Bozak appeared to trip Bruins forward Noel Acciari.

But the refs abstained from making a call.

Mere moments later, Blues right wing David Perron scored what would end up being the decisive goal.

Afterwards, Bruins head coach Bruce Cassidy was candid with reporters about how the bench reacted to the refs decision ... or lack thereof.

“What was being said is he missed an effin call, for obvious reasons," he said.

It was a fairly vocal display from Cassidy, who usually keeps his composure at all times.

"I thought it was a great hockey game. That call probably, and there's time, but it really made it difficult for us to get the win tonight," he said. "So I'm disappointed. So I guess to answer your original question, it was egregious. But we're moving on and getting ready for Game 6."

Cassidy calls no-call "egregious"

As the game closed, the once jubilant Boston fans quietly filed out of TD Garden, thoughts of what could have been a huge moment in the series and in the Bruins long lore hanging in the air.

Now, Boston must go on the road with little-to-no room for error, as a raucous fan base that's been waiting for a revenge for nearly half a century awaits Game 6 on Sunday.

But Bruins defenseman Torey Krug told reporters it's just another test for the team.

"We haven't done anything easy this year," he said. "We've put ourselves against the wall a lot this season, so it'll be another test. I think we will be ready to go."