RE: (Blah!!) Stopping deer
It depends on the situation. If he is taking a path to where he will likely cross several shooting lanes, I'll keep quite and hope he stops in another. If he is chasing a doe, or is moving fast for whatever reason, or I am about to run out of shooting lanes, I'll definitely make a grunt sound to try and get him to stop.
As has been mentioned, when in hot pursuit of a doe, it is almost impossible to get one to stop, but I am sure gonna at least try.
As far as spining one, aim lower in anticipation of him "jumping the string".
I remember a Will Primos show where he specifically noted that Mississippi deer are notorious for being severe "string jumpers", even when not on alert,and he had to aim lower as compared to other parts of the country where he hunts. I had never heard it regionalized as being different in certain places until then or since then, but who am I to argue with Will Primos?