Although many retro FPS games still carry a torch for it, monster infighting feels like a thing of the past. Everyone once knew it was a valid strategy to save ammo and grief by coaxing a stray shot from an unwitting Bad Guy, setting off a chain reaction of chaos and problems that solve themselves. Where is it now?
For games that weren't exactly heavy on narrative (like Quake 2 seen below), infighting was a nice--if brief--reprieve from steady combat. It was the best way to really get a good look at one's enemy in action without cheat codes. Though the AI behind infighting is dead simple, it created a world beyond the player. Monsters hate each other, too, and the player was just one of many annoyances in their immediate vicinity, a tenuous alliance of malcontent that could be broken at any moment.
