HE WASNT BORN IN FULL AMROUR! AND HE HAS A HELMET UNDER HIS HELMET. BECAUSE SUM SMALL CHILD THOUGHT IT WOULD BE COOL TO MESS AROUND WITH YOU. COULD YOU IMAGINE HOW STUPID IT WOULD BE IF HE DID? NO, ITS LIKE THAT BECAUSE ITS FROM THE FIRST HALO AND THEY AINT' GONNA' SHOW U HIS FACE THEN EITHER.
HAVE YOU EVER HEAR OF ANIMATING? THEY ANIMATED A HELMET UNDER HIS HELMET?---------IT'S NOT TRUE----YOU SHOULD REFUSE TO BELIEVE IT UNLESS YOU ARE DUMB!
Yeah, whoever made the video was a modder. Modders are people who put 'Mod Chips' in their Xbox (or ps2, Gamecube, 360, whatever), which allow them to create or download programs that alter the defaults in a specific game. for example, they can increase the speed of the fan in Zanzibar, make Warthogs pink, or even have the SMG fire rockets.
In that vid (and several others like it), the modder detatched the camera from it's normal position and flew it back into the Longsword Jet.
Bungie no doubt had the Helet-under-helmet for just such an occasion.