One thing that I've had some success with is ignoring the melee cleave (divine hope or whatever it is, the priuest aoe heal) can out heal that -- take out their 2 healers at ranged. With two healers dead then the melee becomes a lot easier to burst.

Other tactic -- flame shock the warrior and purge for a few seconds -- after your out of the fear and/or warlock shadow fury, regroup, repurge and flame shock should still be up and use elemental mastery to kill him