NPC pets
 

When you kill an NPC caster that has a pet in one nuke the pet is supposed to poof. Thats the way it worked on live.
On P99 the pet stays up

If you don't kill the master outright the pet should stay after master dies

Also, if you mezz an npc Chanter pet, eg. Evil Eyes, Kill master, mem blurr pet, it should also poof