How did you do? Set up a chain of characters along the path to the Goblin cell, all equipped with the teleport or/and featherdrop spell? Not for the first death knight - that would be a more or less direct port - but for the ones further away?
I let one fast character kite the remaining death knights. I would go close and the death knight would follow. And when he got close to the cage some on else would teleport him. I think I got 4 death knight in there...
