You don't carry a firearm, do you? There is no safer place for a handgun, especially when police will be arriving, than for it to be secured in a holster.
I would have to overcome my training to restore the weapon to operational status -- live round in chamber, not an empty case, if I knew this to be the case. Zimmerman appears to have either the presence of mind to leave the weapon as is (to bolster his case of self defense), or assumed it had it fact cycled fully. In any event all guns are treated as if they are
My mother was a ace shot on Purdue rifle team. In fact they got confused because of the spelling of her name and tried to draft her.
She tried to teach me, but dad intervened.....I've forgotten everything I knew plus some.