Marshall Dillon was in the street with the bad guy who had one of these. Draw! The bad guy says, Dillion makes his move. Then stops mid draw while the bad guy goes for his gun.
Dillion walks in to the long branch, has a beer, referees an argument with Doc and Festis, sets up a date with Miss Kitty, returns to the street finished drawing his gun and shoots the bad guy about the time the bad guy is about 3/4 of the way to shooting postion.