Cover is mandatory! Shooting back is optional. If you can't get to cover then create distance and/or get small. Dropping to the ground is good, but if they were firing at you, was your head their target? I'd rather lie on my back with my feet closest to the shooter to afford my head some protection. I'd rather be called Gimpy from being shot in the foot or leg than be an airhead by a bullet.
MY question is...i pulled my handgun out (low ready) was that a smart thing for me to Do in a situation such as that?