The incident took place with 1:37 remaining in the second period.
He was moving and appeared to be speaking to medical staff before he left the ice, to an ovation from the crowd.
Bruins goalie Tuukka Rask stopped 27 shots through overtime, plus three of the four attempts he faced in the shootout during the see-saw affair at the Bell Centre.
Both teams headed to the locker room after Danault got hurt and the rest of the second period was played after intermission.
"It's different, but this was just another game", said Marchand, who scored in regulation time and got the game-winner in the fourth round of the shootout.
Wind Chill on Sunday; Snow Chance on Tuesday, Wednesday
After a brief warm up, the cold weather is back and will be accompanied by some light snow for the beginning of the week. Friday night lows dip down close to zero, with overnight wind chills as cold as -10°.
"There's no doubt it's a special thing because I spent a lot of great years in (Boston) with an organization that treated me extremely well and I'm showing a lot of gratitude towards them for that", Julien said before the game Saturday.
But for those looking for their first complete look at the local hockey team, you'll be happy to learn that the B's won't find themselves matched up against anybody 'cept the Canadiens when these teams meet again next Wednesday in Boston.
"I wanted to talk to him", said Chara, who said something to Danault as he left the ice.
Victor Mete, in his first game back after helping Canada win world junior championship gold, picked up an assist 3:22 into the game when the rebound of his point shot was tucked inside the post by Pacioretty. Brad Marchand scored his team-leading 18th of the season late in the first period during a Boston power play.
But it was from the Galchenyuk goal that Rask's game improved (though that wasn't going to be hard with a 11-for-14 start to his evening), and the B's along with it.
DeBrusk was sent in alone by Charlie McAvoy to beat Carey Price with a high shot 2:55 into the second frame. They are home to the New York Islanders on Monday (7:30 p.m., TSN2, RDS, TSN-690 Radio).