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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There would most likely be some type of gore depending on how an enemy is killed and what is used to kill it. But it all ties down to the composition of the enemy, for instance, the Cabal bleed/leak oil instead of blood from what we've I've seen.