Henry tells his friends to leave before he's executed because he can't protect them otherwise.
They leave, Ban moves to Ankellman as instructed and removes (kills?) the previous mayor and puts a new one in position which is Harz.
Henry goes to Ankellman to find his friend Ban and ... is surprised Harz is still the mayor after he was executed because ... what? Why wouldn't he be the mayor? They did this in secret, as Henry had instructed so why would Harz have been removed from his position?
And Ban has stayed in Ankellman as instructed, so of course mayor Harz would still be protected by Ban. I don't understand where his surprise is coming from.
Then there's this roundabout way where he's essentially extorting everybody to get what he wants for reasons that are equally unclear to me. Everybody knows his previous self is dead, they saw him die. There's no reason for anybody to assume otherwise, after all the reincarnation magic he used does not exist anywhere in the world and was of his own creation.
Why can't he use his magic to sense Ban's presence in the town and seek him out?