They really should look into the issue of FATE mobs resetting their HP, because someone decides to chicken out and run. The NM's HP should not reset, unless everyone is KO'ed and it hasn't been attacked for a certain length of time. If people are still attacking it, and it runs outside of its bounds, it should just return to it's spawn point and continue the fight. If it's not being attacked, if should slowly regenerate HP, like players. Resetting HP is just unnecessary (at least for NMs), and obviously a major inconvenience.