My take on the scene is that we're seeing it from Rick's POV through most of the conversation between Rick and Shane and then after Rick kills Shane. We're still in Rick's POV when Carl arrives on the scene. Rick thinks Carl is pointing the gun at himself, so we do too. We discover when Carl pulls the trigger where the gun is pointed about the same time that Rick does.
The choppiness of the scene isn't about the amount of takes it took to do the scene. It's about making the scene move fast, creating tension, and making the viewer see and experience things as the director and film editor want him to. I didn't think it was sloppy at all. I think it created the right affects in viewer experience for the scene.
I think this man/woman is spot on. This is what I was trying to say... a month ago. Dang, it's already been a month?
Only 6 more to go... 6...