halo 3 weapons glitch (exo arm glitch)

this is a glitch i ran into while going through a movie this is slowed down to show you. THIS IS NOT A REAL WEAPON THAT YOU CAN NOT WALK AROUND WITH THIS WEAPON IT ONLY APPEARS IN THEATER MODE AND ONLY FOR A SPLIT SECOND!!!!!! AFTER THAT BILLIONTH OF A SECOND YOUR ARMS VANISH!!!!