Knife Technique for Wu Kui

Wherever Riyaz Brown passed by, there were pieces of afterimages. The afterimages took a long time to slowly disappear.
"It really reached the speed of sound!"
Riyaz Brown stopped and a happy smile appeared on his face. After reaching the speed of sound, his body had initially merged with the air, generating friction, and would naturally disappear in the wind without producing a strong sonic boom.
Riyaz Brown put away his smile and said, "For ordinary warriors, only after reaching the...