To me, it seems more likely that the NPC AI is a CROWD AI instead of a collection of individual AI scripts, and it assigns a certain number of people in the crowd to different actions based on their proximity to the event.
Technically, almost every game has at least some degree of AI scripting. If they actually react to the player, it's either "player does X, AI does Y" or "Player does X, AI does Y or Z(chosen at random)" type reactions where the AI responds in predictable ways to the player. Galapagos: Mendel's Escape is the only game I know of where the AI is truly capable of learning and adapting dynamically to player interaction (or lack thereof). It was made in the 90s, and only had one AI character who you had to teach and guide through the game world. Games don't do things like that very often, because good scripting isn't significantly less immersive, and it's a lot easier (and cheaper) to create.



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