hello I needed to make a fight when the player is almoust to kill the opponont it needs to stop , so when the npc is actually on ground on knees he needs to be made invulerable and talk again to pc , is that possible? is there any sample in ck to see? or how u think to do ?

Just mark the said NPC essential, you can fight all you want and he will not die, will enter bleedout everytime.