He has seven goals and 15 assists in 43 games this season.
With less than two minutes remaining in the second period, Chara one-timed a puck that sailed on him and caught Danault around the earpiece of his helmet.
DeBrusk was sent in alone by Charlie McAvoy to beat Carey Price with a high shot 2:55 into the second frame.
Alex Galchenyuk scored his 100th career goal while Max Pacioretty, Nicolas Deslauriers scored in regulation time for Montreal (18-20-5).
Jakub Jerabek swiped at and missed a bouncing puck and Krejci pounced on it and beat Price from close range at 17:42.
The Canadiens had plenty of motivation Saturday night at Belle Centre, playing their rival Bruins, desperately needing points in the standings, and their head coach's 10-year history with Boston.
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The Canadiens later released a statement and confirmed Danault was moving and awake when he was transported to the hospital with a head injury that will require additional testing.
The Bruins outshot Montreal 29-25 in regulation time and 32-30 overall.
According to the Associated Press, Danault "was moving and speaking to medical staff before he left the ice" at the Bell Centre in Montreal. Danault was carried off the ice on the gurney and taken by ambulance to hospital for observation. "That's obviously the first thing that goes through your mind".
"I was hoping that he was not hurt", said Chara. Sometimes we all get hit somewhere in the upper body. Hopefully Phillip is now recovering.
Chara understandably was left shaken by the incident and was the first player to have words with Danault as he was taken off the ice.
"You know there's a rivalry that exists and that's twice now I've switched sides of that rivalry so I guess I could say I'm a little used to it but it's always special when you face your old team".