Have you ever been farming aggressive mobs, been low life to retreat to take care of your wounds, just to get killed by a freshly respawned enemy npc that just decided to sparn right somewhere around you?
I believe that Im not the only one to whom it happaned so my suggestion for this is:
add a non agro timer as well at the same time an invincibility buff to the fresh spawn, so nobody can get killed by that anymore and also wont exploit farming.
For Example we take the Leopards:
adding 3 sec invincibility on spawn as well as 3 sec "peacefull mind" removing hostilities like attacking and chasing others