Brad Marchand took advantage of a bad play by the Leafs and it gave the Bruins the win.
With 47 seconds left in the third, Marchand fired a great shot top shelf to put the Bruins ahead for good.
Jonathan Bernier went to play the puck behind his net and left it for defenseman Martin Marincin. Marincin then passed the puck directly to Marchand who one timed it past Bernier who was still trying to get back to the front of his net. It was a great shot by Marchand, far top corner and Bernier had no chance.
With the win, the Bruins are still in 3rd place in the Atlantic division. They have 1 point more than the Montreal Candiens and Tampa Bay Lightning so every point is huge with such a tight race going on.
Here is the goal, courtesy of NHL.com: