Jaylen Brown and Jayson Tatum scored 68 points to overpower Luka Doncic’s 42 in an offensive duel. Luka Doncic spun and spun and spun, eventually leaning back and pouring in a fadeaway two over Sam Hauser’s head. The second-year forward watched shot after shot rise up toward the rafters and down through the rim during a torturous Thanksgiving Eve for Boston’s switching defenders. But they knew they’d need to live giving up some of them. “Know what you need to live with and know what you need to take away,” Joe Mazzulla said pre-game. “He can get it in a…