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So I kinda bunnied the Shadow, sorry =/. I just did it so that it would put him in a position to take control of Anima. I explained the general gist of my bunnying in my post in BpB, but it all works in favor of your plan.
I have an idea of how the battle will go with the shadow after basing it off or DEMo's translations:
I think that Domon should be consumed 100% at first and the Shadow winning, but then Domon's pure natural energy "burns" the shadow away and allows Domon to hold back the other consumed people while Severus beats the (insert bad word) out of the Shadow.