When Kristaps Porzingis concluded his first six-minute shift Wednesday night, he looked like he’d just run a marathon. His breathing was heavy. He was visibly fatigued. When he took his seat on the Celtics bench, he dropped his head and stared at the TD Garden parquet.

Kristaps Porzingis voiced his frustrations as his illness forced him to leave Game 1 early and had him lacking energy in Game 2.

As the Knicks made yet another soul-crushing run in the fourth quarter Wednesday, all Kristaps Porzingis could do was watch.