Tatum and Smart have single-handedly lost this game for the Celts. Smart is a turnover machine and Tatum constantly forces plays instead of including his teammates in the offense.
I mean, without Tatum's 38 and 10 this is a 20+ point blowout, and without Smart's third quarter offense it's the same story. Tatum, PP, and Smart kept them in this. It's the overall weakness of the supporting cast and our injuries that really doomed us.