If you don't know, just ask.

So I'm sure you have all had this situation happen, probably in the same place too.  I get in to a group for H Blackrock Caverns, not my favorite place but not too bad (just glad it wasn't Grim Batol).  Kill the first trash, down the first boss pretty easy.  All is going nice and smooth.  We kill the next trash, still smooth.  Now we are at the next boss.  I have the rogue block the middle beam, feral druid block the right and mage the left while I tank the boss between the rogue and druid cat.  I always make sure to ask "Everyone know what to do with their target?" to which the healer replied "Ummm, heal him?" ( I love a touch of comedy in a run, lol). I got a yes across the board so  I made the pull and everyone jumped in to position quickly.  Interrupting the fear and doing good so far......until the druid turns in to a giant freakin mob bent on killing us, followed by the rogue.  Ok, we all come back in, rebuff and remark the mobs.  I charge in, position the boss........giant freakin mobs, again.  Come back in, rebuff, remark, charge in......HUGE BEAR KILLING MOBS.....AGAIN!!!!!!   After every wipe, there are a ton of excuses from "I don't know what happened, I was right there." to "I was feared" (which could account for 1 mob, not 2).  So we come back in and I, as nicely as I can being as how the cat was a guildie of mine and having the GM going off on you is usually a bad thing, I like to keep it down as much as I can, say, "ok, just so we are all on the same page, block beam until you get 70-80 stacks of debuff, get out of beam, wait for debuff to tick off, get back in beam, rinse & repeat.".  Everyone says "ok", so we rebuff and I remark.  I make sure everyone is ready and then I charge in as I have done for several tries.....and what do you know, we down her with no effort at all.

Look people, if you don't know the detail of a fight, just ask. If you are afraid you will look dumb because you don't know, you will look even worse after you have killed you party members. People don't mind filling you in about the details of a fight, not everyone has done them all.  But people get a bit mad having to spend gold on repairs that could have been prevented had you just said something, not to mention wasted gold on any food, pots or elixirs that were used and wasted on a fight that ended in death due to lack of knowledge. So please, for the love of all that is good and right in this world.....

If you don't know, just ask.