Originally Posted by monkeymind
I was giving two yards to ensure that the threat would be considered imminent.
I suppose it would look good to let him get as close as possible, but I'd prefer to not let him get that close. A person becomes a threat at about 21 feet. In this scenario, we have our gun out already, so 5 yards is probably adequate to start putting rounds on target. 21 feet is pushing it to recognize a threat, draw and shoot, though.
If you can find a range that will allow this trick, try this:
Holster your gun and stand 5 yards from a target. Have a buddy stand back to back with you, with your backs touching. Tell him to start running when he is ready. When you feel him leave, you draw and fire. Tell your buddy to stop when he hears your shot. The distance he covers will give you an idea how far away someone becomes a threat to you.
Remember if you do this, though, that people don't drop on the first shot, so based on this drill, the distance you are seeing is how far someone can cover and be on top of you as you get your first round into him.