One of the biggest reasons why the Provincial Lord had left the venue with his supporters was in order to escape the area of the tribulation.
If he stayed any moment more he would be forced into defending Tianlong Yun, and his people crossing this tribulation which was not worth it.
Tianlong Yun's gratitude wasn't going to be a given, and who knew just how many of his subordinates he would lose while trying to survive this tribulation.
Considering the amount of people experiencing this tribulation, and knowing the severity of one from his memories, the Provincial Lord didn't dare think about staying.
Not to mention that he had to go and intercept the re-inforcements sent from his Mansion, and make sure that they didn't do anything they shouldn't.
…
On the other hand, Tianlong Yun had started the preparations to welcome the historical tribulation that was about to descend.