The hurricane Four Winds used to assault Asmodeus was a skill from his pinnacle class. It was King of Fury's level 50 skill, Tornado Cross.
He could get a jump at Asmodeus because he, too, had learned mana concealment. Four Winds always had good martial arts talent. If not for his being bogged down by having to attend to guild affairs, his advancement in martial arts would not be slower than Leavemealone.
He learned the basics when he was training inside Everlasting Heavenly Legends' Space-time Chamber. During that time, Domon and Wong were also in the chamber aside from his master, Murong. Leavemealone started learning mana concealment at the time, so Four Winds took the chance to request the same training as well. His expertise was still far from Jack's level, but it was enough to get him close to Asmodeus before the devil sensed his presence.