Opening fire now is akin to being a troublemaker. Su Xiao needs to observe every subtle movement of the Ant King. The Ant King's reaction speed is incredibly fast, making the hit rate for sniping an undisturbed Ant King very low.
There are only three opportunities for a kill. First, if the Ant King doesn't notice Su Xiao, Su Xiao can snipe from a distance, which is considered a cold shot. However, given the current situation, this is clearly unrealistic.
The second scenario is when the Ant King's movements are restricted, in which case a hit is almost guaranteed.
