BOSTON — The Celtics had one of their toughest losses of the season on Monday night against the Jazz, blowing a 14-point first half lead against the Western Conference cellar dweller. The hosts allowed the Jazz to claw their way back into the game with a 38-point third quarter a sequence that left Joe Mazzulla making some telling comments about his team’s performance.

“Our first half was great, and I think the third quarter, they got the best of us, and they played harder than us,” Joe Mazzulla said. “It was a combination of just transition, offensive rebounds, and then some of their dribble-drive stuff, not being able to defend without fouling. So you have to be able to put a full game together. The first half was good. Third quarter cost us, and when it’s a close game like that, it’s an

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