Using the concealed weapon technique to deploy the Mother-Son Soul-Chasing Ball is undoubtedly difficult, and even with Tang San's liquid-level Spiritual Power combined with his experience from his previous life, it still required such a long time to accumulate power. It was definitely not going to be easy for Wu Bingji to master it.
But relatively speaking, the ice element was indeed much easier to cultivate. Tang San hadn't misled Wu Bingji on this point. The ice element was more stable than the wind element, and being solidified, combined with the characteristics of the Ice Blast technique, made it indeed easier to use when applied effectively. However, it still required step-by-step practice.
The way Tang San propelled the second launch of the ice needles was to some extent inspired by the methods of launching missiles with firearms from his previous world. Theoretically, it was absolutely feasible.
