I recon he meant that a MOB stays at his post no matter what. So if you run away it wont follow you. Of course MOBs that dont chase at all should have summon ability, be invulnerable to ranged combat/spells or have insane high HPs so they dont turn into a no risk exp source.
If yes please have a look at this post.
http://www.eqemulator.net/forums/showthread.php?t=21484
I am pondering the idea in my last post in this thread for a while but I havent enough time lately to try to implement it.
If you meant MOBs running when they are low on health or feared:
It is disabled right now cause of the lack of fear pathing data/algorithms.
You might want to read this threads:
http://www.eqemulator.net/forums/sho...t=fear+pathing
http://www.eqemulator.net/forums/sho...t=fear+pathing
http://www.eqemulator.net/forums/sho...t=fear+pathing
and this Wiki entry from FNW:
http://www.eqemulator.net/wiki/wikka...PathingProblem