In regard to the first scenario where you've drawn on the guy because he had a weapon, but he's still advancing toward you even after dropping it, you cannot let him get close enough to you to be able to take the gun from you. I think it would be foolish to try and spray him with OC after already drawing on him. By the time you've drawn your OC and sprayed, he could already be on you taking your gun. Having been sprayed in the face by OC myself during training, it takes a moment for it to really set in and he could cover alot of ground during that time.
Even unarmed, the guy knows you have a gun pointing at him and is still advancing toward you. You have to assume that he is crazy and/or intends to do you serious harm. This in itself could be justification of deadly force. I would give verbal commands to stop and possibly back away if feasible, but if he crosses the 20' mark I would fire.
This of course is assuming you were justified in drawing your weapon in the first place. If not, all bets are off.
Even unarmed, the guy knows you have a gun pointing at him and is still advancing toward you. You have to assume that he is crazy and/or intends to do you serious harm. This in itself could be justification of deadly force. I would give verbal commands to stop and possibly back away if feasible, but if he crosses the 20' mark I would fire.
This of course is assuming you were justified in drawing your weapon in the first place. If not, all bets are off.
