Find the hall hung with white drapes off the outer walkway. Use the altar at the far end to orient yourself. Qiufeng fights inside this petal-strewn hall.
Qiufeng follows the first white blade arc with another quick cut. Defend through the sequence and counter briefly once he stops. If pushed against the latticed doors, move back into the middle of the hall for room to evade sideways.
After the fight, stay in the hall and inspect the blue flower at the altar to continue the memory quest.