I'll add to the confusion. I started on live in Sept of 2000. I remember old world mobs would chase you forever but Kunark mobs had 'lazy aggro'. If you got so far away they would give up chasing you but you would remain on their hate list. If you got within something that was like three times normal aggro range they would give chase again.
OK, I found a mention of it on this page from 2002:
Quote:
Lazy Aggro
In Kunark and Velious, if you are beyond a certain distance from a mob, it will lose interest and no longer pursue you, though will still maintain you on the hate list with an increased aggro radius.
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http://youngsdojo.tripod.com/Pulling.html
On P99, lazy aggro seems to wipe the hate list.