Okay, so I've said before that I'm pretty clueless about copyediting. So mostly I just go for rhythm and instinct, then trust the copy editor. Lately, it's been feeling weird.
I'm picky about rhythm, but that's it. I know there are several theories of comma rules out there. One is the fortysomething-rule theory, the seventeen- or eighteen-rule theory, and then there's one around seven, and one that boils it down to two or three. (I forget the exact numbers.)
I don't care which theory you believe in, but will you tell me which you think is correct and why? Here are some examples--I didn't have time to make them sound like interesting sentences, LOL. Is A or B correct? (Or are they both passable, or ... you know. Whatever.)
A: I couldn't look at him as I edged past, and I kept my eyes hidden.
B: I couldn't look at him, as I edged past, and I kept my eyes hidden.
A: "Slide me your gun," he ordered, after I stood up.
B: "Slide me your gun," he ordered after I stood up.
A: I finally just shrieked, and left, slamming the door behind me as hard as I could.
B: I finally just shrieked and left, slamming the door behind me as hard as I could.
A: And that was that.
B: And, that was that.