The four demons had been Prophet's students for a very long time.
The four of them had a common ground -- they were born impoverished and had all experienced tragic childhoods.
Even though one of them was a vampire, that child was deemed as a cursed blood.
Because of that, after the four of them were taken in by Prophet, they gained individuality in the Demon Realm and started to diligently study the teachings from Prophet.
They've always held Prophet to be the most wise and farsighted person in the Demon Realm. Even though this sage had the look of a young child, a look completely different from people's impression of her, the four of them would always tense up their body and focus their attention the moment Prophet asked them questions.
Unfortunately, due to being in the theater, three of the students did not manage to clearly hear Prophet's question.