Securing Sect Leader Jin

When Wei Wuxian decides to take Wen Ning's place as temporary Jin Ling Night Hunt Protector he runs into Jiang Cheng. They manage to have a civil conversation, but how did things turn out this way? They'd agreed Jin Ling's position as Sect Leader needed to be solidified asap. But what kind of situation was this? How could this be happening? Wei Wuxian did not sign up for this!