To the guy with the star:
Either know it well, or be patient and willing to run around to get it done. And don't bail.
To the guy in the Helpers guild:
If you are in a guild named "helpers" you probably shouldn't just leave without notice.
Ok so last night I join this Inferno LFM, and nobody knows it really well but we've all run it at least once. Thing go reasonably well with some running around but we're getting it done and manage to do everything except the last set of flames to light and put out and are having some trouble getting to the south living side room. I split off to try and find it, in the meantime the rest of the group finds the right room. At this point the caster (helpers guild) starts lighting the torches and brings the elemental, meanwhile the healer (star holder) announces he's out of mana and onto scrolls, (apparently none of them were heal scrolls).
Over voice chat I hear "kill the mobs before you light the torches" from the healer. Seconds later "ding", "ding", "ding", healer down, caster down, one of the melees down. I sit in silence. Caster drops group without a word, which then the star holder starts the fatal conversation that we can't complete without the caster. I remain silent because I have had enough of this guy's style anyway. He leaves, at which point I ask if everyone left still wants to struggle through. they do, and res out and come back it with a pocket cleric. We wander through, this time having more fun, get to the right room, elemental is up. We kill it. struggle to the other side and grab a wind mephit (took two actually, I killed the first one by accident), dragged it over to the torches and blew them out. no caster needed. We finished and got our sigil pieces. Didn't get the extra chest but we where happy none the less.
Moral of the story: well there isn't really a moral, I just want those two A$$hats to know we finished without them just fine. T