A montage of Kevin Garnett  and Paul Pierce  in the first half with the tagline “heart of a champion” left the Garden crowd in awe. Then, a Knicks barrage left those same fans in shock. Finally, the Celtics  showed that heart, rattling off a 20-point run midway through the fourth quarter and making a game of it, but it proved too little, too late.
Garnett came to play, and Pierce finally showed up in the fourth quarter, but an 88-80 loss in Game 6 ended their season, opening up a Pandora’s Box of questions nobody in the Celtics organization wants to answer. That’s another story for a different day. Here’s what went wrong in their final game of the season.
WHAT WENT WRONG
Worst first: The Celtics were lucky to get out of the first quarter only trailing by 14 points. They shot 25 percent from the field. Garnett made his first three shots, and his teammates finished 1-of-13 in the opening quarter. Pierce went 1-for-8. While the Celtics settled for jump shots, the Knicks scored from everywhere. Seven minutes into the game, New York had as many points off turnovers as the C’s had total points. No other word to describe it but ugly.
3 falling: The Celtics missed their first nine 3-pointers, including five bricks from Pierce, and the Knicks’ defense held the Celtics to 14 points through the game’s first 18 minutes. Meanwhile, Pablo Prigioni made three of his first four attempts from beyond the arc, scoring as many points in the first quarter as he had in any game in the series.
Everything: The Celtics looked gassed. Through three quarters, they had 15 field goals and 17 turnovers. C’s not named KG made 8-of-37 shots entering the fourth quarter. It seemed as though they left everything they had on the Madison Square Garden floor in Game 5, when Garnett, Pierce, Jason Terry , Jeff Green  and Brandon Bass  combined for 201 minutes. Then, the fourth quarter happened, and the Celtics scored more points than they did in all of the first half. It was ridiculous and unsustainable all at the same time.
WHAT WENT RIGHT
Green light: Nobody on the Celtics could get within 10 feet of the basket, so Jeff Green gave it a shot. And another. And another. He started just 1-of-6 but led the C’s with nine points at the break — thanks to 6-of-8 shooting from the free throw line. If anybody else could’ve beat his man off the dribble, the Celtics wouldn’t have been in such dire straits at halftime. But Pierce settled for contested jumpers when he should’ve been deferring to Green, who finished with 21 points on 12 shots. Pierce scored 14 on 18 attempts.
The runs: Any sign of life was a positive. That’s how bad the C’s offense was. Back-to-back Green and Terry 3’s with four minutes left until halftime capped an 8-0 run that left the Garden wondering, “Wait, they’re only down 10?” With four minutes remaining in the third quarter, a Terry triple punctuated a 9-2 run that did the same. And, of course, the miraculous 20-0 run in 4:05 that slashed a 75-49 game to a six-point deficit, breathing life back into the building in the fourth quarter.
Melo J.R.: The only thing that kept the Celtics from completely getting their doors blown off was another poor shooting performance by both Carmelo Anthony (7-23 FG) and J.R. Smith (5-13 FG). If only Raymond Felton  (11 points, 7 assists) — who killed the Celtics all series — forgot to show up, too, the Celtics might have had a shot.