Blood Physics
1: the blood particles from ragdolls can cause an actual blood decal when touching any block or entity, like ravenfield.
2: instead of blood cube particles GPU physics could be used instead and would stick to block and entities, like Gblood (Gmod mod).
Blood Additions
depending on where your crosshair is when you hit a mob blood could trickle down on the mob from that spot, like in Overgrowth.
