I was looking at the wiki entry on Quillmane and read the following:
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Does this mechanic actually work and basically alert the player if Quillmane popped "somewhere" in the zone immediately after the placeholder is killed? I wasn't aware this was something you could do to check triggers when you are spawning something with a pet class.
I always thought not knowing if Quillmane popped or not was the hardest part of doing the cycle.