Why would to leave the bad guys view? What is to stop him form leaving at that point, why not just tell him to go away rather than tell him to get on the ground if you dont intend to keep him there. Law enforcement doesnt re-holster until the guy is in cuffs and under their control.
The cops will not just come in guns blazing because you are holding a gun, just an announce yourself and put the gun on the ground when they tell you to, and never, ever, point it in their direction. You will be treated as a criminal and handcuffed until they get the full story.