Black Rock Depths

We have been running some guildies through this instance for a few weeks now. It is a huge place. Not so bad for us at level 70, but for the guildies, it has to be a pain when if they get too close to them, all the mobs run past us at level 70 just to attack them. But, we manage ok. So we go into the instance, make it all the way to the tavern or whatever its called in there. The bar patrons are all yellow to us. Well, the guy we are running in here is supposed to talk to someone to get a door to open. Never having been in here before, I have no idea who is who and what is what. Somehow the guy ends up talking to the wrong person, or attacks someone and oh dip, it's on then. The whole tavern starts attacking us, both the top and bottom level. With two level 70's and his level 54 we still don't stand a chance. Too late, you done pissed someone off and he and all his buddies have politely kicked our butts! My two guildies die, somehow I manage to stay alive by being out of aggro range of them all even though I am standing right in the middle of it. The only way out is to hearth out. We decide the only way to finish this is to come back another time maybe they will forget who we are and we can be friends with them again!