Zhao Zicheng was stumped and felt that Rong Xiu was joking. Shangguan Yue does have shocking talent as a Xuan Master, but she was also an eighth-grade Xuan Master back then, so she definitely couldn't teach Rong Xiu skills to suppress an eighth-grade Xuan Master. It seems like he doesn't want to talk about it.
But Zhao Zicheng didn't mind either since a Xuan Master's cultivation was different from that of a warrior. One normally needed a mentor to guide them.
The mentor-mentee relationship developed would be even more intimate and close.
Perhaps Rong Xiu had his own reasons for not reporting his teacher. After all, there were indeed too many strong, reclusive warriors in this world that didn't like to show themselves off or casually expose their identities.