If an Npc gets Shot at they will go into implemented or dynamic cover positions away from the general direction of fire. This can also apply to heard gunshots
If an Npc is hit in the Chest they will hold their wound and grab their pistol with their other hand (this would only apply to very vital areas like the chest neck or stomach)
If Npc is hit in the Leg they will have a limp walk animation and walk slower (Possibly crawl away depending on the damage)
If Npc is hit in the Arm they will be less accurate (Possibly drop their gun and switch to their pistol)
If Npc is Killed their npc allies will react to it with voice lines (Trepang 2 style)
If Npc's Leg is Dismembered they will crawl away until they bleed out (opposite for zombies)
If Npc is shot they will swap out with their buddy's for cover.
I could probably add way mor but this is good for now