The Duke of Vélez cares about his own evaluation regarding anything and tries to make himself look bigger. Therefore, had he not been leaking to those around him that he was involved in one part of the Hero Summoning ceremony? Even if they were people the Duke of Vélez considered trustworthy, among them there might be ones under the Empire's influence.
Therefore the Empire knew in advance that the Hero Summoning ceremony would be performed, and tried to perform the Hero Summoning ceremony in the Empire as well. There, had they not taken Division Head Hütter who had achievements? If one does not think that, the skill is too good.
