ABU DHABI, United Arab Emirates — This isn’t just Jamal Murray casting aside questions about his health and downplaying his recent injuries. In fact, as if he had a definitive display of athleticism for the media planned to perfection, he pounced at the rim Friday for a contested slam dunk — moments after the doors had been opened allowing a throng of reporters to watch the last 30 minutes of Denver’s practice. Point taken. “I feel good,” a curt Murray said during the team’s media day at Ball Arena, rejecting any notion that he was dealing with lingering injuries as training camp began. One week later, and on the opposite side of the globe, his emphatic dunk supplied some meaningful evidence.