Pretty much impossible? How can you even say this? Do you mean without teleport? Sure that I can get, but with the teleport? Just stick together, take out adds first and foremost and you're done. I don't even see what could be killing you. Are you running around trying to get the oracles? That's not necessary you can build up enough for a super even when you get marked. As long as you have decent weapons (read: good sniper/heavy maxed out) the dps should be no problem.