MIAMI — The mandate was rudimentary but nonetheless was reiterated to veteran Heat guard Terry Rozier during a team session ahead of Friday night’s game against the Oklahoma City Thunder at Kaseya Center: Just be yourself. Playing deferentially upon entering recent games, and typically not turning to his own offense until later stints now that he has been cast in a reserve role, Rozier said the emphasis from the coaching staff was to attack from the outset. “It’s about being more intent on what we want to do,” Rozier said of the session with coach Erik Spoelstra.