Zuo Feng's disturbance of the mind came a stage earlier than it did for ordinary martial artists, but his firm resolve helped him get through it without much danger.
Not only that, Zuo Feng also laid the foundation for his cultivation path through this disturbance of the mind... A deviation in "The Way" won't affect cultivation at the start, but becomes crucial when advancing to higher stages.
Back then, when Zuo Feng used the Devouring Wolf pack to deal with those eighteen gray-robed martial artists, that bald guy had deviated from "The Way" during his cultivation. He abandoned the single blade he had rigorously trained with, in a haste to break through a bottleneck, and started cultivating with dual blades. Although he successfully broke through the bottleneck at that time, he ultimately got stuck at the Muscle Tempering Stage and couldn't progress further.