The formidable enemy was ambushed and successfully killed by the soldiers hiding in underground foxholes, which was within Luo Zheng's expectations. It wasn't that the enemy was too weak, but rather that they were unaware they had entered the battlefield and were a bit careless. The Hummingbird could detect the Hook Tribe's Armed, but failed to notice the concealed soldiers. If the enemy knew they were on the battlefield, they would never make such a fatal mistake.
On the battlefield, even an insignificant mistake can cause irreparable harm. A sudden close-range ambush by a prepared Sniper is a surefire execution. No one can escape, even if the opponent is the formidable Pot Lid Head Special Warfare Group. However, that restrained Sniper made Luo Zheng wary. Choosing restraint while comrades are killed means the Sniper is either indifferent or adept at emotional control. Luo Zheng believes in the latter; indifferent people can only fight solo and can't integrate into a team.
