The gunshot just now revealed that the people inside the valley are enemies, not friends. Luo Zheng no longer hesitated and decisively issued an order for free shooting. This means that whoever finds a target can shoot directly without requesting permission, and it also means Luo Zheng's apprehension about these enemies. Free shooting helps to fully utilize everyone's combat power, act upon discovering an opportunity, and avoid the delay and passivity caused by waiting for instructions before taking action.
As a qualified Commander, Luo Zheng would not allow himself to make such a low-level mistake. If the identity of the other party is uncertain, Luo Zheng wouldn't issue an attack order. Since the other party is unwilling to reveal their identity and fires back, it indicates they are hostile, so there's no need to show mercy.
