Boston came up big in the second half in Miami to take a 3-2 series lead 1. Game 5 of the Eastern Conference Finals was a microcosm of the 2021-22 Boston Celtics season. The Celtics weren’t playing great in the first half, yet they weren’t getting beat badly either. The Miami Heat were playing better, but they couldn’t quite shake Boston. Much like the 2021 portion of this season’s schedule, the Celtics were down, but you had the sense that they could, and would, be better. In the second half, it was complete and utter dominance. This isn’t about flipping…