Boston rallied behind point guard Isaiah Thomas and Fizdale blamed blown defensive assignments for setting the tone for the Celtics ' sizzling second half .
Point guard Isaiah Thomas scored 36 of his career - high 44 points after halftime .
Boston rallied behind point guard Isaiah Thomas , who scored 36 of his career - high 44 points after halftime , and Fizdale blamed blown defensive assignments for setting the tone for the Celtics ' sizzling second half .