Because the Super Martial Arts "One Qi Transforming into Three Pure Ones" is originally an active offensive martial art, without the ability to actively attack, it's basically useless.
Although the low realm junior brother couldn't clearly see Lin Yifan's exact location, the higher realm Xu Haolin could see it perfectly.
This is due to the change in soul power brought about by an increase in strength.
Humans are controlled by their souls; the stronger the soul, the clearer the things they can see, like a high-pixel camera would take clearer photos compared to a low-pixel one.
Lin Yifan's techniques are disguised, so Xu Haolin still hasn't figured out which category Lin Yifan's martial arts belong to.
Swordsmanship comes in various forms, and only by finding the right path can one research and cultivate it better.
"Damn it! This kid is really cautious."
Xu Haolin couldn't help but sigh, not knowing what Lin Yifan was hiding.