There are two editions of the mod and both editions handle essential NPCs the same way, but where they differ is in how protected NPCs are handled. NPCs will wake up 1 - 4 in-game hours later, or you can manually revive them with a healing spell at any time. This mod fixes that and also gives you a variety of options to choose from while the NPC is knocked out, such as looting, moving, and/or reviving the poor sod. In the vanilla game, essential and protected NPCs simply take a knee when they take too much damage and then they get back up to fight almost immediately and there is no way to stop this from happening. This mod will knockout essential and protected NPCs when they lose all of their health and go into bleedout. Essential Knockout Overhaul is a Skyrim Combat mod by Sevencardz.