From what we have seen so far, killed enemies will disintegrate without any blood effects. This really bothers because it looks so unreal and stupid. I don't want the game anywhere near as gory as Gears of War, but I want some realistic blood effects and ragdoll to balance out all the space magic.
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If you get disintegrated there would be nothing but energy left considering how much energy it would take your blood would boil very quick.