Why the Usurper Warlock (left side of Drume) disappears?

Question

Hello. I'm starting to charm the usurper warlock on the left side of drume. many times I am about to kill him and they disappear. Anyone know why?

Comments

Bounac works with a rotation based on the time. Each 1 hour the kesar goes to talk with drume, they make a truce and the attack ceases momentarily.

Answer 1

When someone engages Drume bossfight, Kesar will spawn there in same area next where Drume spawn, this will cause some of the Usurpers despawn and disappear.