Killing Malkus disperses the spell that keeps the Moth Priest trapped. However, it seems that Malkus succeeded in breaking the Moth Priest’s will and even Malkus’ death did not end his hold.
The Moth Priest runs around, looking for the person who killed his master. J’Zhirr has no choice but to fight him. This one will have to do it carefully for he does not want to injure the Moth Priest so much that he dies.