When Duo Hong saw that the Death Spider had finally been killed by a few of his subordinates, he finally relaxed. However, now that Duo Hong heard the sound, Duo Hong thought that there was a Death Spider.
Therefore, he looked back and happened to see Lugh. Lugh was currently smiling at Duo Hong.
Lugh knew that Duo Hong wanted to kill him, but Lugh did not want to kill him for the time being. Duo Hong had already used money to buy his life.
Lugh wouldn't kill Duo Hong before Duo Hong attacked him again. Lugh was a person with professional ethics.
Another reason was that Lugh didn't like Duo Hong. After Duo Hong left his family, he was trash. Lugh didn't like Duo Hong, so he didn't kill Duo Hong.