The easiest way to remove a slave collar like the Nimans use is to kill the one who owns it. Since the authority can only be transferred to someone in direct contact with the current owner, that should still be someone in convoy.
Following that simple logic, by the time they have killed everyone who is not enslaved, the collars should have just fallen right off. The Merged Primal Echoes are thrilled to get to test that theory, mangling bodies to ensure that none get resurrected. Only half the escort force is dead when the collars come free, and the commoners of Skyview join the fight.
