C1156 Persuasion
Or in fact, Xiao Luan didn't want to show his dignity earlier because he didn't believe that Shen Shu could really control him.
Thus, the submission he spoke of was only a temporary measure. To delay time was not true submission. The moment he recovered, he would kill Shen Shu.
If those hopes were shattered, he would go crazy and would not give in even if he were to die