Make sure gun is loaded. Be sure to aim gun away from self. In the event of a skirmish, do not use gun as an instrument to hit people with. A gun is for shooting. To use gun effectively, discharge your firearm.
Guns make noise.
Do not get scared by the noise and run. Blood is an inevitable result of gun shot wounds. Do not run to the assistance of a wounded person if you wounded them. If they can talk, they aren't dead. Guns can kill.