*dOoM*

Well, actually it's a bit more complicated than this. Pets and NPCs are indeed handled differently. If a Pet kills a NPC exclusively, you won't get any kill credit, meaning you can't loot the NPC and you won't get any XP. This means that pet owners have to tap the npc themselves, at least with 1 dmg. I guess they use this mechanics to ensure that pets won't be exploited as some kind of bot. Something worth mentioning is that Totems count as Pets too! Regarding NPC vs. NPC fights, its a bit different here. You CAN get kill credit if you do enough damage to the NPC. Meaning: If two NPCs are already fighting, you can still get credit if health isn't below a certain value. I don't know the exact percentage, but it should be somewhere close to 50%(-10% ?). So if the NPC is untapped(meaning no other player has attacked it yet) and you deal at least 50% of the damage, the kill counts for you. NPCs should NOT be lootable whatsoever if this condition isn't true. I played a 70 hunter in BC and 80 mage in wotlk and I can confirm that these mechanics are still valid. Would be nice if someone could confirm the percentage on NPC vs NPC fights.

So this should work like this: While you are in the air, non-flying npcs will aggro you only if they have a ranged spell and as long as you are in range of that spell. Once you gain height and get out of range they stop casting, evade and return to their original location. Pathing NPCs continue the path they were following. Non flying NPCs that don't have any ranged spells won't aggro you until you are in melee range or if you are floating closely above the ground in aggro range. It will start hitting and following you until you gain height again. After you get out of range and thus out of combat, the NPC immediately evades and returns to its original place. Getting dismounted by other players or NPCs trough transforming spells, knockbacks, stuns, nets etc. is not possible while flying. An exception are the bombing run quests. In any case, NPCs that are NOT flagged for flying should not leave the ground whatsoever.

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