If you need to draw a weapon, the situation has already deteriorated to the point that further warning of any kind is a waste of time and might well be hazardous to your own health. The only "warning shot" that is fired should be the one (or two, or three!) that enters the bad guy's X-ring.
--Pistolenschutze (Pistol Shooter)
Cum catapultae proscriptae erunt, tum soli proscripti catapultas habebunt. (When catapults are outlawed, only outlaws will have catapults.)