ANOTHER SUGGESTION: a buttom for backstab or sliding throats (knife only) can be used when the enemy doesnt see you, it will cause a lot of bleeding but not imidiate death (will result in death tho)
Enemyes using medkits: after a fair bit of damage was done they will try to run to give themself medical treatment (will save them from artery damage, will give them 25% of the health they lost)
(WITH ''downed enemyes'') beying able to shoot corpses
(WITH ''shooting corpses'' ) downed enemyes: enemyes will sometimes just fall on the ground when severe damage is done or brain damage is done, they will wake up and look for the player while allerting other enemyes of your presence.
(with theese two you can make the player make sure the enemy is actualy dead)