In the scene in which Arnold and John are trying to decide a plan, the guy that tries to help John, (thinking John is being threatened by Arnold), and Arnold almost shoots the guy with his .45 auto. He fires a round.........But look at the hammer before and after the shot. First it's uncocked, then it's cocked, and uncocked when Arnold puts the gun away.
Alrighty.... First off... When Arnold pulls out the pistol it is not cocked.
But... He pulls the slide back himself and cocks it.
If you know anything about automatic firearms then you should know that after he fires the pistol, the slide will come back and c*ck the hammer again. (Provided it's not a double action only pistol [Which it wasn't])
Then when John picks up the gun and hands it back to Arnold it's still cocked, and Arnold sticks the cocked pistol down the front of his pants. (An unsafe action to say the least)
When using a double-action semi-automatic handgun, you can fire a first round without manually cocking the hammer. Then, for your second shot, the hammer would stay back because of the slide mechanism. I don't remember the movie that well, but is it possible that Arnold let the hammer down??? Oh, and by the way, there is no such thing as a .45 auto
I just saw the movie again recently, and he had plenty of time to let the hammer down. Also, stoop dawg is right; it's not a .45 auto, it's a Defender .45