I think the screenshot says it all...How are these Elite Combinations supposed to be killed? I mean - seriously? I knew that "Hell" difficulty was hard, but they should lock several combinations that are clearly unkillable, at least thats my opinion.
EDIT: I got it now... I somehow managed it to separate the Elite from his minions. That made it much more simple.
(4 minions + 1 elite) * 5 illusions = 25 beams on the screen... hell yeah