For instance, a man cut me as well as the vehicle beside me off on the highway about three years ago. The other driver honked, I did not. Guy thought it was me and followed me to the gas station. Guy pulls to a stop right in front of me and jumps out with a baseball bat. I reach down and put my hand on my firearm that's holstered between the seats. Guys gets up to my driver's side windows and starts punching and kicking my door. I draw my firearm up just high enough to not quite clear leather and let the guy see whats in my hand. Guy backs off, gets in his car and tears off. I call 911 to report the incident and an officer takes a report.
In this case I could have let the guy get more worked up than he currently was and perhaps have been forced to shoot him if he was able to gain entry into my vehicle. I also could have done exactly what I did and diffuse the situation, so no one had to perhaps die.
I don't consider what I did as drawing since I didn't completely clear leather, but even if it had I doubt the situation would have turned out any differently.