Game Mechanics: Lifetap Aggro

[Khaleel]

This is how I remember pet/player hate interactions in live:

If an NPC hates a pet more than a player, the pet will be the target of the NPC's attacks unless the NPC can make melee attacks against a player. The NPC will not, however, pursue a player if they step away.

This is what I observe on p1999:

If an NPC hates a pet more than a player, the pet will be the target of the NPC's attacks unless the NPC can make melee attacks against a player. As a player tries to move outside of melee range of the NPC, the NPC will try to follow the player for a very short distance, so a few steps will not suffice and running out of melee range will most likely shift the mob away from it's original location slightly.

It seems to me that there is just a check missing in the NPC AI that tells them not to pursue if the reason they're attacking a player is only because they're within melee range. ...which is completely off topic now that I look at the OP.