Kristaps Porzingis waved his finger to express his disagreement, walking away with a sarcastic smile on his face. On the bench, Jayson Tatum held both his hands on his head, incredulous at what he just saw.

The Celtics certainly did not agree with the call, or the other unfortunate officiating decision that led to this moment. But on a night in which their defense cost them, they had no right to complain. They went down in fitting fashion on Monday night in Indiana.

With the game tied in the final seconds, Bennedict Mathurin put up a 3-point prayer at the buzzer that missed. But the whistle blew. Porzingis made contact on his arm. The Celtics did not have a challenge remaining, and with 0.6 seconds remaining, Mathurin made two free throws that sent the Pacers to a wild 133-131 victory.

Jaylen Brown scored a season-high 40 points to lead the Celtics, who were still left puzzled at another call that cost them in the waning moments. On the previous possession, Brown dribbled into the corner in triple coverage against the Pacers and pulled up for a long two. Initially, it looked like he and the Celtics caught a break as Buddy Hield was whistled for a shooting foul after swiping him from behind.

But the Pacers challenged the call, and surprisingly, it was overturned. Though it appeared Hield hit Brown in the head, officials ruled that he made contact with the ball first, and gave the Pacers possession with two seconds remaining.

Though the Celtics were displeased with the result of those final calls, there was no excuse for them letting it get to that point. Tyrese Haliburton went down with an unfortunate hamstring injury late in the first half, but the Pacers still managed to thrive without their All-Star guard. After leading by nine at halftime, the Celtics gave up 74 points in the second half, including 44 in another bad third quarter in a brutal defensive showing.