Searched not a repost if you say it is link it.
I posted in my other thread how to get the going down? achivement but later i found out this works on anything.
Tested on Deathknight
Anytime your falling and you know your going to die use rune tap right when you hit the ground. You should be left with 1-200 hp and still be alive. Im not sure if this works with other classes self healing spells but it might just try it.
Basicly
1. Fall
2. Runetap
3. ???
4. Profit