This works with burglar's the best but here's is the basic principle
You pull the elite mob and all it's ads, let it chase away from its spawn point with all the ads then have someone in your group mez the boss. Now, disband from your group and use whatever skill you have to drop aggro (Hide in plain site works great for this). Since you disbanded the other players are not a member of your group and therefor do not share your aggro, the mobs simply return to their spawn point leaving the elite/boss mezzed, regroup with your fellowship and enjoy an easy kill on that boss Ad-free.
This works great if you only have 2 or 3 people and need to do full fellowship quests as well
