Video: Did Heat expose weakness in Celtics defense?

The playoffs with their best of seven series format is a different beast than the regular season. We've seen time and time again an NBA head coach identify a weak link in the opposing team's offensive system or defense. The Miami Heat's head coach Erik Spoelstra is one of the best. So did he find a "fundamental" problem with the Celtics defense? Coach Nick breaks it down in the video below: