I really have no idea on how to make it recognize you were killed by the npc.
Buuuuuuuuuut
If you manage to get killed by the npc, either you are too stupid, or you did it on purpose, so you will not need to check how you got killed xD
Buuuuuuuuuut
If you manage to get killed by the npc, either you are too stupid, or you did it on purpose, so you will not need to check how you got killed xD