The monk's concealment was very clumsy.
As strong as Xie Tian, there's currently no way to dissolve the soul oath.
Thus, Xie Tian was very certain that the monk, due to the loss of state fortune, compounded by Wu Chen's words, and his own six-sense cultivation's speculation, felt an overwhelming fear and then killed Wu Chen before fleeing in panic.
This is also the reason for the clumsy concealment by the monk in a hurried panic.
Xie Tian greatly admired the monk.
Firstly, he admired the other's decisiveness in killing.
Secondly, he admired the other's despicable shamelessness.
Although Wu Chen died at the hand of the abbot of the Great Thunder Sound Temple, which was quite to Xie Tian's liking.
"But, did I ask you to kill him...?"
Upon exiting Wu Chen Temple, Xie Tian softly said, "To Lei State."
Even though he guessed the Great Thunder Sound Temple had long been emptied, he still refused to give up.