Found this while grinding rep today that if you cast your mount then loot while its at about .5 or so seconds left till its casted you will be on your mount and get the loot.
so in other words
1. kill
2. mount
3. near end of mount cast time loot it
4. ?????
5. run off on your mount and profit
and imo this probably wasnt intended to happen by blizzard so i believe it is an exploit.
(my first post so hopefully its up to par)