People guard against tigers, and tigers guard against people. The same goes for interactions between humans and immortals.
Thus, when immortals manifest their powers, there must be a Galloping Immortal Disciple to serve as a bridge.
Galloping Immortal Disciples are messengers who reside between Yin and Yang. Only with their mediation can humans overcome their fear of immortals and accurately convey each other's intentions.
Xuan Yu, with nearly four hundred years of cultivation, communicates effortlessly with humans and doesn't need a disciple to relay messages.
However, to ensure the prosperity of Cat Immortal Hall's incense offerings, it's inevitable to possess a Galloping Immortal Disciple for external manifestations.
But Xu Qing, as the Grand Sect Leader of Cat Immortal Hall, is too busy to perform the duties of a Galloping Immortal Disciple.