is it possible to BxB, BxR, and double shot in halo 3, or is this video fake?

[ben_3600]

http://www.youtube.com/watch?v=9DFjTYzcoQA
lol, thanks sherman, but im not an idiot. i think i know what buttons make me exit a game enough not to press them...

 

[Velvet Dan]

Here's the invincibility cheat in halo (meaning you'll never die)... Durring a match quickly press Start, Up, A, Up, A....

NOTE: This sequence has to be done quickly to effect

 

[shermanf72]

"Technically" It is, but in reality you have to have 2 hands pushing the buttons at the same time, it would take a LONG time to master, and would be completely useless when you cant strafe or anything while doing this. I would forget that you ever saw this Vid, because it is a waiste of time to try and attempt it.
EDIT: Dont lisin to what the kid above me said, it will just get you to quit the game.