LAKE BUENA VISTA, Fla. – Getting angry worked wonders for the Boston Celtics. Their first win in these Eastern Conference finals just happened to come two nights after Marcus Smart sparked a loud and emotional series of shouting matches inside the Celtics’ locker room, all of that starting only a few seconds after the Miami Heat won to take a 2-0 lead in the series.That lead is down to 2-1 now, the Celtics playing brilliantly in Game 3 and leading wire-to-wire to take a bunch of newfound momentum into Game 4 of the series on Wednesday night.“I’ve always been saying that before you see the rainbow, it has to storm,” Smart said Monday, speaking about the post-Game 2 dustup for the first time publicly.