The Shadow Moon Hall origin return master responsible for the shops should have something to say about that. He has worked hard to win over Yang Kai and the unknown refiner grandmaster behind him. How could he allow the Shadow Moon Hall to ruin everything just because of some stupid Xu family?
Other than that, let them come. Yang Kai will pick up their souls and refine them with the Annihilating Demon Eye. He will gain much from absorbing their spiritual energy and martial insights.