In the 70-29 run that occurred the problem wasn't that Amir wasn't playing enough. It was that our perimeter defense was awful, Atlanta shot the ball like they seldom ever do from outside and the Celtics went on an offensive funk.
Amir has little to nothing to do with perimeter defense. He has nothing to do with Atlanta getting hot from outside and he is one of the least important offensive players on this squad. Amir could have played 40 minutes and this team was still losing by 25+ points tonight