The Cabal, if you didn't know, bleed heavily when killed with precision kills. This will expose young children to disgusting amounts of blood, which will cause mental issues later down the line. I don't want the children of Destiny becoming mass murderers. If you feel the same, please sign this post. Hopefully Bungie will remove these enemies, or at least the blood.
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It is not blood. They don't know what the black tarry substance is, but they know it isn't blood.