It's not just that Chen Fei's previous display of martial arts prowess was unmatched even at the early stages of the Combined Aperture Tempering realm.
It was the significant improvement in speed compared to over a year ago when he demonstrated his speed during the flag-snatching battle.
Back then, in the Haiyue Cave, Chen Fei's speed in martial arts was not the worst among all, but it was close. Only Meng Heng, who had recently broken through to the Combined Aperture Tempering realm, had a speed that could match Chen Fei's.
However, at that time, with the speed Chen Fei had just displayed, he had surpassed Mo Shiyi and Qin Haishan, who had been in the Combined Aperture Tempering realm, Second Tier for years, and had been even faster than Zhu Guannu.
This extra bit of speed had completely disrupted Zhu Guannu's previous plans.