So, OKC held the Celtics to 27 points in the seocnd half.
The Celtics, at full strength, played this game to win. KP played his best game since last season.
OKC, missing one of their best players (Holmgren) and one of the best defensive guards in the league (Caruso), just dominated the Celtics during the second half. I think you could probably count on on hand the number of clean offensive possessions the Celtics had during the last 18 minutes of the game.
The Celtics defense remained very good for almost all of the game, but when OKC turned up the defensive intensity on the Celtics, the Celtics just fell apart, and the game gradually went from Celtics missing shots to Celtics turning the ball over repeatedly, to, at the very end, Celtics making defensive lapses.
The only good thing the Celtics can take from this game is how good KP looked individually. The bad thing is how awful they were in spite of that.