i found this a while back while doing voa. i am a warlock and engineer. its doable by other classes aswell but you need slowfall and a speed buff. i have only tried it with nitro boost so far tho
The movie is made by me and its my char.. just in case you wonder.
[ame="http://www.youtube.com/watch?v=9pVOhR2DVIs"]YouTube - VOA glitch place.[/ame]