This was the very first iteration of a mobile enemy AI, and it’s ability to detect and assign targets. This system would later be ripped out and completely overhauled, but this is it’s humble beginnings.
Interestingly, before this, I had toyed with the idea of only having static enemies, but shyed away from it as I felt it would quickly become very easy to cheese, and not very fun to play.
Parabellum 