Before Su Chengyu killed He Shou Xin, he had already considered all the consequences of such an act. Right now, Hong Zhen Ting could be considered a trump card under Su Chengyu's control. This card, once it could be utilized, must be put to work.
Although Hong Zhen Ting could not cope with Stone Sword Edge, Hong Zhen Ting had been dominating in Linjiang City for many years and had the backing of the Black Dragon Commerce Association. His extensive network of relationships he had built over the years should not be underestimated.
While it might be impossible for Hong Zhen Ting to compete against Stone Sword Edge, it would not be challenging for him to devise a plan to extricate Su Chengyu.
For the sake of preserving his own life, Hong Zhen Ting would undoubtedly go to any length.
Of course, if Su Chengyu had truly committed a capital offense, even the various methods employed by Hong Zhen Ting might not be of any help.