Sixers' Ben Simmons keeps competitive fire under control / Keith Pompey

Sixers guard Ben Simmons reacts to his dunk during the first half of the Sixers-Heat Game 5 playoff matchup on Tuesday.It’s going to be interesting to see Ben Simmons’ competitive spirit in the Eastern Conference semifinals.

NBA fans may start drooling if it’s anything close to how the 76ers rookie point guard played against the Miami Heat in the conference quarterfinals.

“He was a quiet killer,” Sixers coach Brett Brown said. “He really was a silent assassin in many, many ways.”

Simmons didn’t overreact to the borderline cheap shots he received from the Heat. The only time Simmons got in an opponent’s face was when he stepped toward James Johnson in Game 4 to protect teammate Robert…