What fool would want to threaten you knowing you are armed instead of a helpless victim?
Uniformed LEOs are attacked all of the time.
IMO, if you feel you are in danger, draw the weapon. If you do not feel you are in enough danger to warrant deadly force, attempt to leave, but do not "act" like you are going to draw. That is just a mild form of brandishing. You are
threatening the individual with a firearm which is your stated intent.
What happens if you succeed in running the guy off only to have him get PO'ed and call 911 to report that you
where threatening him
with a gun? His word against yours. You do have a gun. His name is on the police form under "victim." Guess which heading your name is under?