What the Bruins are doing without their best forward and their best defensemen has been truly impressive.The B’s are a decent 5-5-0 since McAvoy took a slapper to the face in a road game against the Montreal Canadiens, and they are an impressive 3-2-0 since David Pastrnak went out of the lineup with an undisclosed injury around the Thanksgiving holiday. They won back-to-back games for the first time on Saturday night since those two major injuries with a solid 4-1 victory over the New Jersey Devils at TD Garden, and now sit tied with the Tampa Bay Lightning for first place in the Atlantic Division.