Wu Jundu was a deeply calculating man who never did anything without absolute certainty.
Although Chen Xuan seemed to have exhausted all his lethal moves and reached his absolute limit, Wu Jundu would not have accepted Princess Di Yunli's proposal if there had been even the slightest chance of Chen Xuan holding something back. Unless, of course, the condition of the proposal was that Chen Xuan must defeat him in order to leave.
Just as Wu Jundu turned his head to see what King Wuji's opinion might be, he heard Chen Xuan say in a bone-chilling tone, "Since we are fighting, it will be a fight to the death. There is no need for any talk of ten or a hundred moves."
Chapter 3559