Everyone has their own combat style, and Su Xin's had always been to overpower his opponent relentlessly from the start, thereby giving them no chance at all; it could be described as extremely fierce and domineanating.
Originally, Su Xin had intended to take advantage of Ji Wuling's affected Primordial Spirit and decisively eliminate Yi Jianting in one fell swoop, before returning to confront Ji Wuling.
However, what he hadn't anticipated was the immense strength of Ji Wuling's Primordial Spirit. His own strike, fueled by all the power of his Primordial Spirit, only affected Ji Wuling briefly and wasn't enough to kill Yi Jianting.
According to the information Su Xin had gathered, Ji Wuling was not supposed to have practiced any Primordial Spirit Mystic Method.