Yea i'm not seeing the relationship between the two..what does a pet class have to do with mobs respawning after they've been trained?
This is a reference to the Beastmaster class in FFXI. Monsters used to walk back to their normal range before the anti-MPK (Monster-Player-Kill)update. In that update they changed the way the BST skill "Leave" operated, making it so that if any non NM mob went unclaimed outside of its normal roaming area, it would vanish if enmity wasn't re-established on it in a few seconds. The mob would then respawn a few minutes later inside its normal area.
This change was implemented because Leave was the main (but definitely not the only) way of setting up an MPK. I had a friend who used to MNK experience parties in the Boyahda Tree when they started killing off his pets. He'd charm a bunch of Mandragoras and slowly work toward positioning them all near the entrance by leaving and charming them all until there was a large group. Then he'd let them all wander back to their normal areas, and kill everyone in their path.
EDIT: A little mind-wandering here... The comment about bringing mobs across zone lines reminded me of a friend who played WoW once telling me that a group of people dropped a boss monster that got healed when anything died near it in the middle of a city and it killed everyone for a few hours until a GM removed it. That of course then made me think about that FFXi video that used to be on Youtube where someone left a raged Simurgh in Rolanmart and it killed all the AFK bazaar characters and everyone who walked out of Jeuno. Edited, Nov 9th 2009 4:03pm by LadyOfHolyDarkness