So I ran like a bazillion heroics Sunday evening and had the usual mish mosh of players and experiences, but one stands out as particularly amusing. We we're making our way to the last boss in Utgarde Pinnacle and three pulls before the boss all hell broke loose, I think the tank had a cat on his keyboard or something, and we wiped.
Coincidentally our feral druid who was DPSing announces in all caps, yes really, that his wife had just asked for sex and he added that sex was better than badges. I quipped back with something sarcastic implying that his wiping must turn her on.
Hilarity ensues when he changes his story again in all caps and said it was his girlfriend that asked him to raid with her. Yeah, he was full of the Angus of manure. To which I simply responded...
"Just finish the instance you punkerdoodle."
After a few moments to contemplate that, I bet it was the first time he'd ever been called such a thing, he agreed to finish, but asked us to speed things along. Not like we were going all that slow to begin with non stop chain pulling. We finished the instance of course and parted ways.
If I leave a group, which is rarely, it is because I don't see things progressing and I just go without explanation because by that point it should be obvious and preceded by numerous wipes. You don't just bail at your earliest inconvenience.
One time I did leave a group on the second trash pull since I was waiting to see if I could get into a raid and 5 minutes after their start time I figured it was a safe bet I wasn't needed. I queued for a 5 man, got in, buffed and we started pulling. I was healing and got the whisper that I was indeed needed on the second pull in the Forge of Souls. I let the group know, but by that point that tank had rocketed off to the next trash group. I rushed ahead and kept everyone alive and healed everyone up before leaving.
As a rule of thumb I allow an hour for a heroic when I know I have something else coming up and don't like feeling rushed. Ironically there are few tanks that can, and more importantly make good on that ability and actually do, pull an instance faster.