In the jungle, where visibility was severely limited, if someone was spotted, a large troop might need to shout a command to identify friend or foe. However, as Gao Yang's group only comprised three people, they would shoot on sight, regardless of who it was. Accidentally killing someone was still better than getting killed themselves; this was the key tactic of mercenaries in jungle warfare.
Once Bantuna spotted someone, he didn't hesitate and took the initiative to fire, gaining the upper hand. After completely controlling the situation, Bantuna, silent and stealthy like a specter, crawled out again.
The darkness inherently provoked a strong sense of insecurity, and Gao Yang couldn't help but start to worry about Bantuna.
Jungle warfare was already challenging, and fighting a night battle in the jungle without night vision equipment was a death sentence unless one was an expert.