This was a very realistic problem. The so-called 'killing people and preventing them from divulging a secret' was so. Ye Xiwen would certainly die if they didn't die. He might escape if one great sage expert were to chase him. However, what about a group of great sage experts?
How would he escape then?
Also, these people wanted to kill him as well. Therefore, letting them live could prove to be even more troublesome for him.
