Boston had a particular rallying point earlier in Game 5 after Krejci, who missed the first two games of the series with an injury, exited the game following a knee-on-knee hit from Chris Wideman in the neutral zone. The Bruins were not pleased with the hit or the response from the Senators.
"Krech is a huge part of our team. It was great to have him back in the lineup for a bit. You kind of see a questionable play happen on that," said Brad Marchand. "Krech is a pretty tough player and will pretty much play through anything. I guess that's part of the game, it happens a lot out there. Got to play through it.
"You don't ever want to see guys get hurt in a game. We're playing for a lot here. Guys going down is never a good thing to see, especially when it's your teammate. You want to have his back."
The Bruins picked up their alternate captain by overcoming a two-goal deficit to force overtime, thanks to tallies from David Pastrnak and Kuraly in the second period.
"That's the sign of a good team," said Frank Vatrano. "I think we've been like that all year, we've been down, we've always fought our way back.
"The Hockey Gods were with us last night, we had a couple calls that didn't go our way and we found a way to win. It's a great feeling in this room."
No lead - on either side - has been safe through the first five games of the series. The Bruins overcame deficits of one goal and three goals in Game 1 and 3, respectively, while Ottawa erased Boston's two-goal lead in Game 2. All five games have been decided by one goal, leaving little margin for error.
"I think it's just everyone playing for moving on to the next round," said Vatrano. "You're playing for something much more than just two points, you're playing for a Stanley Cup. Obviously there's much more will than there is in the regular season, everyone's playing for their season.
"I think that's why there's been so many lead changes. Nobody wants to lose, that's what makes the playoffs so fun. Credit to us for coming back in that game [Friday night]."