In the Ft Worth Police academy they taught us little things to distract someone who has the drop on you, like Kraig says, get them talking. Another "trick" is in the hands up position wiggle your fingers, they look at the movement, and BAM draw why they are distracted.
These are obviously last ditch maneuvers. With consistency and practice you can draw pretty quick.
My rifle and pistol are tools, I am the weapon.