He and Xu Yicheng were playing two roles.
After controlling Xu Yicheng, Qing Chen specifically had this puppet stab people in the spleen.
Apart from the old fellows in Taboo Land 002, apart from Uncle Li Dong, and apart from Ding Dong, no one else knew he possessed the Taboo puppet ACE-019; in the rainy night, no one could see the thread between him and Xu Yicheng.
Thus, everyone treated Xu Yicheng as him, while he himself played another unknown Transcendent.
In this way, although "Qing Chen" killed decisively, he was still regarded as an Ordinary Person not worth cautious attention.
The one worth caution was the other unidentified Transcendent.
No one knew who this unknown Transcendent was, nor did they associate him with the Knight.
In this battle, Qing Chen did not use fallen leaves as weapons, specifically to avoid associations with the Autumn Leaf Knife.