Its the way the DamageBits are sent. Each damage has a bitsum of damages that all equal up to what's going on with the damage delt. For example knife damage is (DMG_BULLET | DMG_NEVERGIB) and so on. Grenades do a different damage than a bullet. So it has a different bit quantity. etc etc. Not fully sure how the core handles it, but that's what's going on there.