[TigersEye]

It would depend on the type of holster. There are a lot of holsters with clips, like tape measures have, for clipping on your belt or waistband. An anonymous Sanford police officer leaked an account that says Martin saw the gun and went for it, according to Zimmerman, and they struggled for it. At that point you would likely move from defending against blows to trying to retain the gun.

This animation may help you understand better how a semi-auto is supposed to operate.

3D Glock Semi- Automatic Pistol (Function Animation)

Groovy music too! /s

[Cboldt]

-- An anonymous Sanford police officer leaked an account that says Martin saw the gun and went for it, according to Zimmerman, and they struggled for it. --

Some poster here, I forget who, speculated that Trayvon may have effectively "pulled the trigger" by trying to pull the gun away from Zimmerman's hand.

It may be that Zimmerman didn't intend to fire a shot, at all. But when faced with loss of possession of his gun, well, I'm sure his state of mind changed!