couple more thoughts (took me a while to figure out dfc was death fist citadel haha). i remember fighting that champion. i soloed him on my necro by sending in the pet then standing out of range of his ae knock back. i could still life tap him from a distance and heal my pet. i haven't tried it with the 6 team (or your 3 team) but i think it would be a similar deal where you could get taunt on the sk, stand in the corner in case of knockback on your other two guys, send in dog which might proc the block ae and then heal / slow with defiler and nuke with warlock.