Originally Posted by kot
...Any suggestions on how to improve when there is a need to aim quickly, for example when drawing from a holster?
Training and practice.
But of course, what you saw was a movie and not true. However, with training and practice, one can learn to very quickly pick-up the front sight and get good hits. At Gunsite, par for what are called the "school drills" is, from the holster, (1) one shot in the cranial vault at 3 yards in 1.5 seconds; and (2) two shots in the center of mass at 7 yards in 1.5 seconds.
It starts good trigger control, what is called the compressed surprise break. The trigger press needs to be smooth, but quick, with only the trigger finger moving, but without trying to make the gun fire at a particular instant. And that takes a fair amount of slow, smooth, deliberate practice to develop. But too often when folks are trying to shoot quickly trigger control goes out the window, and they jerk the trigger.
Also the flash sight picture helps. Here's how Greg Morrison describes the flash sight picture (Morrison, Gregory, The Modern Technique of the Pistol
, Gunsite Press, 1991, pp 87 - 88, emphasis added):
...The flash sight-picture involves a glimpse of the sight-picture sufficient to confirm alignment....The target shooter’s gaze at the front sight has proven inappropriate for the bulk of pistolfighting. However, the practical shooter must start at this level and work up to the flash, which becomes reflexive as motor skills are refined. With practice, a consistent firing platform and firing stroke align the sights effortlessly. This index to the target eventually becomes an instantaneous confirmation of the sight-picture.
...Using the flash sight-picture programs the reflex of aligning the weapon’s sights with the target instantly....There is good reason for sights: one needs them to align the barrel with the target reliably....