Previously in the fight with the experimental humans, Ruan Munan discovered they had a weakness - these experimental humans indeed had a high physical strength and swift reactions, yet they lacked self-awareness.
People with self-awareness constantly perceive external dangers. But these experimental humans, like zombies, relying on their terrifying physical strength and reaction speed, as well as numbed pain senses, only know how to charge recklessly. However, without self-awareness, they cannot perceive external dangers.
Especially dangers from behind.
Earlier during the scuffle with the first experimental human in the villa, Ruan Munan found it particularly easy to launch a sneak attack from behind. But because of the experimental human's immense physical strength, even a successful sneak attack from behind couldn't cause much harm.
But, things are different with a gun.
