In Grave Robber's Chronicles, why did Muffled Oil Bottle smell like a dead person? Why was one of them killed by the other?

Grave Robber's Chronicles was a fantasy novel. The plot and setting were all fictional. The smell of a dead person on the stuffy oil bottle was a novel plot set up to portray the mystery and characteristics of the stuffy oil bottle. At the same time, there was no definite answer as to why one of them would be killed by the other. In the novel, the relationship between Wu Xie and the stuffy oil bottle was complicated. There were conflicts of interest and misunderstandings, which eventually led to the tragedy. This is just a plot in a novel. We shouldn't understand it as a true reflection of interpersonal relationships in real society.