via Matt Porter of the Boston Globe,

His lower lip swollen, an inch-long cut dotting his cheek, and with little interest in dwelling on the matter, Brad Marchand said he was sticking up for his teammates when he mugged Capitals center Lars Eller late in Wednesday night’s a season-opening rout.

“The celebration was unnecessary,” said Marchand, who was ejected at 13:54 of the third. “He took an angle in front of our bench and celebrated in a 7-0 game.”...

It earned the oft-disciplined left wing 17 penalty minutes for instigating, fighting, and a misconduct.

“That’s good,” coach Bruce Cassidy said. “He’s a proud guy. I think Eller was celebrating a little on a 7-0 goal. That’s his prerogative. Marshy let him know that’s not acceptable.”

Below watch the goal and Marchand fighting Eller.