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I'm worried, as mentioned before, that the heads will resurrect/summon new skeletons, so we need to try to stun the Knight. Maybe the skeletons will die too, but if not, we'll finish them off later. Revan said that if you attack through a barrier, enemies need to pass a Will check, but I doubt that works on heads/ranged attacks and magic. In any case, let him clarify this when he returns; it will be clearer then. If the barrier reflects everything, then it should definitely be used (if the heads don't care about the Will checks).