I just watched that moment in a play-pause-play-pause slow-down, and it's still pretty apparent to me what happened. Yes there was botched choreography, but it wasn't to the magnitude that some of you guys have been pointing out (for the last two years no less LOL

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Bats doesn't simply
grab the gun from him. He places one hand down on the right side of the gun, and clutches it so that the gun is elevated angled with the right side up. With his left hand, he comes in underneath the gun on the left side and sends it up like a teeter-totter into the guy's face. The guy collapses from the blow. Still holding the gun, he turns and whacks Lau and then turns back, finding that the "teeter-totter smash" already knocked the guy out.
The issue, of course, is that the gun never actually hits the guy in the face. It's supposed to, but it just misses. Thus, the guy was reacting to the choreographed "teeter-totter smash," which wasn't executed to fullest of on-screen accuracy.
It was not, as far as I can tell, a simple matter of Bats just grabbing the gun and the guy falling like an invisible fist hit him. To me, it's pretty clear that the movement and the motion in Bats' arms that prompts the gun to spring towards the guy was intentional, and the false hit just came off looking a bit too false. If sped up a little bit more, it seems less noticeable, as the sound effect, the springing of the gun and the collapse of the guy all look appropriate without catching the lack of actual hit. Changing the angle to an over-the-shoulder or behind-the-back shot would have worked as well.
Granted, I could be totally wrong, but that's how I always read the scene. I actually remember thinking, upon first or second viewing, that using the gun to uppercut the guy was pretty sweet. I never saw it as the guy just falling. That is until you have the luxury of a DVD and YouTube and you can see the gun never makes contact. Maybe he swallowed a fly?
