Don't worry, its going to happen. I'm a mere iLvl85 and will get it pulled off me. Tanking is a game of watching meters. Most of the time I don't see the monster I'm fighting. Too busy watching aggro and monster health bars. If you are with very high iLvl players there really isn't much you can do about it. They could help you by watching their meter, but alot of players just don't care anymore, they just do what they want. Roll with it and just keep pressing onward.