As a veteran Police Lieutenant, I learned that there is no one more dangerous than someone with nothing to lose. The same applies to the injury-plagued Boston Celtics. They lost two of their top-3 players, one (Gordon Hayward) early in the season and one (Kyrie Irving) late. One vital back-up (Daniel Theis) is out for the season, and another (Marcus Smart) may be back sometime during the playoffs.
The crew that remains healthy really has nothing to lose heading into the post-season. Rival Eastern Conference teams are just drooling to battle what they perceive as a vastly-weakened team.