Found the link posted in another topic, here it is:
http://www.youtube.com/watch?v=qMGqLSb38X01:38 - You can clearly see that Game has no weapons out and is completely invisible. Mustang is waiting at the bottom, looking at the ceiling (because he can see through it) and then following Game's character as it falls down the shaft. Kickflow even asks if Game had any weapons out and he says he didn't.
2:40 - Watch as Mustang's aim goes all over the place (especially when he jumps). He does random 360s and aims wildly several times. Then, if you keep watching, at
3:00, Mustang shoots as soon as the Hidden player reaches the top of ladder. Again, having no weapons out making him/her completely invisible.
3:38 - It's difficult to see because Mustang is blocking the view, but he kills another Hidden when completely invisible.
4:26 - Mustang doesn't shoot down any of the long corridors until he "sees" a Hidden player. Notice he only shoots once and later at
4:46, Portalboy says that Mustang shot "randomly".
5:12 - There's nothing there, yet he decides to shoot and injures a hidden player.
6:12 - Shoots at another invisible player, but misses because he/she jumps over Mustang. You can see Mustang's aim go up, following the player as he/she jumps over him, and when the player lands, Mustang fires again directly hitting the player and killing.
The rest of the video you can see Mustang trying to act like he isn't using it.
This guy is an idiot and a cheater. Badspot needs to revoke his key.