Nobody should be surprised by the Heat's fast start. Miami has made an extra effort to up the tempo of games early, and that's exactly what they've done early in Game 5 against the Indiana Pacers. All the guys off the ball are moving on offense, and everyone is aggressively trapping the Pacers on defense.
Just know that it's been only four and a half minutes. The Pacers will settle down and this will be a game.