BOSTON — Brad Stevens keeps it short and sweet. The Boston Celtics head coach has a knack for communicating with his players, whether it’s getting more out of them in clutch situations or helping them keep their heads in the game when the moment might get the better of them. Such was the case in the third quarter of the C’s 92-87 win over the Milwaukee Bucks in Game 5 of their first-round NBA playoff series. Celtics guard Terry Rozier and Bucks guard Eric Bledsoe have been exchanging words all series, and the rivalry boiled over when the two got into a scuffle that saw Bledsoe get hit with a flagrant foul and Rozier