Shoot rpg's out of your primary or secondary

this glitch is simple. all you do is start off with a primary or secondary weapon and hold down LEFT on the DIRECTIONAL PAD (not the analog stick or L), then you keep holding left and hold down X (you must have an rpg, easier with rpg on X), then while still holding the buttons i stated have some one shoot you in the back. IF you do it right it will fire immediatly an rpg or it wont fire anything and you will be kicked out of the weapon change box. Also, you cant lock on but you can run with it.
Notes:
1: I did not find this
2: For an ally to do this to you friendly fire must be on
3: You must be alive (DUH)
4: Works with the seal rocket launcher to
5: I would like some reps :) even though i don't need them.
6: If you need me to show you or want to know some more glitches meet me on socom ftb2 online play
Player name: daretodoit or superted