I tried to search but did not find anything.. so sorry if its a re post or in the wrong section.
well, this is a little trick that is useless for anything else then annoying friends .
log out in air and when he logs in he falls and dies.
1. wait for your friend to go to the bathroom or something else that will leave his logged in character unprotected (or even better if you got his account info).
2. mount up on his flying mount and fly as high as you can
3. press log out
4. wait for the log out timer to hit 2 or 1 and then unmount.
you are now logged out in the air without the flying mount and when your friend logs back in he will fall down and die .
you can add this fun but useless thing to your bag of annoying tricks together with the classics like stripping him naked, destroying his HS and running to the opposition faction city while he is away .
have fun