It probably a whole simulation lesson for Bai Ji consider in the previous trial we had the cat girl queen forgot her name as the guardian gatekeeper stopping Bai Ji from attacking and making her think instead of going there with brute force wait I think they might be slowly being back the old Bai Ji that has the minds of Ji Bai since as established by Early Chapters Bai Ji is carried by her power and status as Vampire Princess while Ji Bai is more of a strategic heroic knight lord/king of knight that fought in battle and making sure not to underestimate his opponent while Bai ji does alot during the first arc of the story early chapters.
This is my guess/speculations not Web Novel Information