safeguy said:
1. You don't play bluff with a tool that has lethal potential.
2. "Gun in hand" is a reasoned action given the totality of circumstances and the likelihood of a threat. Be prepared: (He could have easily had a weapon too).
3. If you break holster and issue commands it should be because you have perceived a potential threat and you have the discipline to follow through.
4. Gun in one hand and cell phone in the other would have been good too. Vebal commands like; "Do you see this gun! You are under arrest, the police have been called." are good adds.
I disagree with all but the last.
In general, I think your points are correct, but I think there are situations that warrant drawing and threatening (bluffing), even though the imminent danger has passed. Remember that in the scenario I painted, you've just witnessed a murder by a BG who has the presence of mind to obviously disarm himself so as to remove your reasonable fear that he's about to hurt someone else. Are you really just going to let him walk away? You can't legally use deadly force. You could tackle him, but what if he has a knife or something? I'm not getting within arm's reach of someone I know is a killer.
In that situation, I'm going to bluff for all I'm worth. I'll do my best to appear a crazy man, a twitch away from pulling the trigger. At the same time, I'm going to keep my finger well away from the trigger, and keep the gun pointed in a safe direction. Those weaken the bluff, of course, but it's the best compromise I can make between safety and keeping him from escaping to possibly hurt someone else.
In the case of most lesser crimes, I'd take the approach you suggested. Well, I'm not sure I'd point out the gun -- that could easily be interpreted as threatening. In a situation where you don't want to take the risk of getting an assault charge by threatening, I think you're better off not mentioning the gun at all. If you are willing to risk an assault charge, you may as well draw. If the guy is looking and you can make the gun's presence clear by putting your hand on it, you can probably make a good case that you didn't do it to threaten, but just to ensure you had quick access in case he did something that warranted deadly force.
I know this is a pretty far-fetched scenario. I like to explore the edges to get a better understanding of the appropriate responses.