What does "cluster together" mean in the sentence below?

[rezaaa]

"Still, human marauders and feral Freaker-wannabees, called Rippers, who occupy camps (aka outposts), are fun to rumble with, even if they present a somewhat easy challenge because of a very forgiving style of stealth gameplay. While long grass and plenty of cover help, run-ins with human enemies are made easier by the fact that enemy AI is rarely clustered together" Source:https://www.ign.com/articles/2019/04/25/days-gone-review It's a review of a video game. I know what "cluster" means generally, but in the context of AI i don't.

 

[jutfrank]

AI here refers to the enemy NPCs (non-player characters)—in other words, those characters whom you can kill.

The NPCs in this game don't tend to move around in groups. Instead, rather fortunately for you, they move around separately, which means it's easy to stealthily pick them off.

to cluster = to move around in groups