In GGO, there was a system called ≪Bullet Lines≫. In Japanese, it would be ≪trajectory prediction lines≫.

This was a red line that would be seen by a character who was being targeted by a muzzle, excluding the initial bullet when the victim was not aware of the presence of the assailant, like when they were sniping or ambushing. It was something that enabled one to see the trajectory of the incoming bullets in advance, allowing for evasive action.

Of course, there was no such thing in reality; it was defense system assistance function that was created to increase the enjoyment of the game.

Seeing the Bullet Lines and taking the minimum necessary action to avoid them was the basis of battles against people in GGO.

However, even that wasn’t useful in cases of „being shot from around 3 metres, when the bullets would be suddenly fired at about the same time the muzzle is aimed“.

(Squad Jam Volume 1, 55)