Mount on your friend normal mount

[Nefti1]

I just accdiently found this while doing http://www.wowhead.com/quest=28000"
for the rainbow generator, when my friend caught the imp and mount up, her mount have the option to jump in acting as if that was a multi passenger mount..so I jumped on, worked on me too.
So:
Do the quest above link
Catch imp
mount up
now your party mates can jump on your mount.
work as long as you carrying the imp on your back.

[Inshanity]

Sweet, nice find

[Shayden85]

Did you try how far and long you can carry the imp ?

[Ellion]

Did you try how far and long you can carry the imp ?

I think debuff has no time limit, and will disappear only after death. Battleground, dungeon, and even relog isn't removed it.