Practice was over, but Henry Melton wasn’t done catching his breath. He huffed and puffed toward the locker room with his eyes, mouth and nose wide open searching for air wherever he could find it. “This altitude is not a joke,” Melton said, chuckling. “No joke at all. Melton didn’t know much about Denver, besides the thin air, when his agent reached out to him to gauge his interest in joining the Broncos last week.