Su Xin had a confrontation with Qiu Baichuan, resulting in the death of several constables from the Six Gates. This made Qiu Baichuan extremely frustrated.
As a local emperor in Bashu Province, this was the first time he had been so humiliated.
Especially since Su Xin had killed several of his men, considerably diminishing his authority within the Six Gates.
Ordinary constables thought it was quite simple; you took men to trouble Su Xin, but in the end, he came out unscathed while you returned disgraced. Furthermore, a few brothers had been killed. How could your men look up to you, Qiu Baichan?
Su Xin was powerful, Qiu Baichuan admitted, but in all his years at the Six Gates, he had never seen someone who defied the rules to such an extent.
If Su Xin was struggling against him within Six Gates, Qiu Baichuan was confident that he could use his reputation gained over the years to completely undermine Su Xin, forcing him to slink back to his Jiangnan Province.