Big one is blood. Bleeding is a product of your blood pressure. If you’re alive when stabbed, your heart is still pumping. That means blood is gonna be trying to get out, and it’s gonna be all around messy.
A corpse on the otherhand? Heart isn’t beating. No real bleeding. There is blood, but it’s akin to cutting into a block of playdough; no real mess outside of the dirty knife
Similar logic can be applied to things like blunt force trauma; You’re not gonna bleed much if nothing is pushing the blood out.
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