Only plot hole I could find

Rating: 10/10 (12 February 2005)

People nag about no one being able to lie still for 6 hours and other lame stuff, Adams bad death fake etc. I disagree with all that, knowing they do have answers.
What I cant find an answer to thou, is this: At the end, when Jigsaw is about to leave the room, Adams quickly grabs the gun to shoot him. Jigsaw notices this however, and electrocutes him before Adam can fire.
But, whit what bullet was Adam going to shoot with? Surely you know that the only bullet there was, was the one Gordon had shot Adam with. Sure, Adam may have, under the circumstances, completely forgot about the bullet issue, but Jigsaw who planned all this, shouldve been very well aware of it. That would mean, he didn't have any reason at all to quickly electrocute Adam.
Just mentioning it, doesn't make the movie bad, I loved it.