Rajon Rondo dribbled frantically, unable to find an opening against Al Horford’s hounding defense. He stutter-stepped, crossed over, tried an in-and-out dribble and then crossed over again, losing the ball as he transferred the ball from his left hand to his right. The clock expired with the Celtics failing to get off a shot and missing an opportunity to close out their first-round playoff series against the Atlanta Hawks. None of the Hawks players reacted at first, which was strange considering they had just staved off elimination. They were probably just surprised.