In Qing Yu Nian's book, Yan Xiaoyi was a ninth-grade master. Why couldn't Si Lili kill him? This problem was not specifically explained in the novel, but it could be guessed that Yan Xiaoyi's strength was not limited to martial arts. He might also have some special ability or technique that allowed him to remain calm and accurate when shooting Si Lili. He might even be able to use some technique to avoid Si Lili's attack. In addition, the relationship between Yan Xiaoyi and Si Lili in the novel was also rather complicated. He might not have intentionally hurt Si Lili but had no choice but to make such a choice for some reason. Or perhaps he had to make such a choice to protect others. In Qing Yu Nian's book, Yan Xiaoyi was a ninth-grade master. Why couldn't Si Lili kill him? It required further analysis and speculation based on the specific plot and background.