Ok Guys,
I'm making some good progress with the video but the Laptop I'm using is phantom painfully slow. I've made quite a few observations which are quite interesting. Hopefully I can post the video up today.
But... I am beginning to feel the trailer is actually from two different sections of the game. Lending to a theory that this is perhaps a recurring state for Big Boss. I have been going frame by frame with the trailer and noticed several things.
For example did anyone spot people who look like the Nurse and the bald Doctor in the same scene where everyone gets shot in the corridor? The bald man is incredibly tall. I certainly believe this is the most out of place scene in the trailer due to how everyone is lined up in a calm manner whereas the rest of the trailer has Big Boss and friend being stealthy. It's been really hard to place this section with the rest of the trailer as the continuity is all wrong. I still believe there's a big clue with the ECG Monitor and ventilator sound effects when the doctor speaks (you don't even see the character), then it cuts to Big Boss, simply lying on the floor looking at the prosthetic arm - how odd.
What's also really odd is the helper. "On your feet soldier, the whole place is coming down" - you see him aid Big Boss supposedly to his feet, then the next scene Boss is still on the floor.
What's more odd is how BB uses the trolley to rise, but all the contents crash to the floor - notice how the helper makes no attempt to acknowledge this at all - imagine how loud the sound of crashing metal on the solid floor would sound - enough at least for the helper to look back, but no. Nothing. This lends to the theory that the helper is a PHANTOM or a figment of BB's imagination, a metaphor for him getting on his feet and escaping. A vision of his former self because BBoss acts like a rookie. However, we see him driving the ambulance which doesn't fit the theory unless it is a dream or two sections of the story.
Did anyone notice that the flaming horse is a winged unicorn? (I assume so as it's pretty obvious). Does it have a name - Pegasus perhaps?
But having dug around, there's this debatable area around the SNATCHER project where BB is actually turned into a cyborg. There's lots of details surrounding that including:
The Outer Heaven showdown, three years ago... His arms, legs, right eye, and right ear, they were all gone. He was barely alive at all. Then a tyrant of the East became interested in him... Petrovich Madnar was ordered to accelerate his Snatcher plan. It was tested on the body of Big Boss with success. Now part of him is human and part is not.
The Metal Gear Solid 4 Database's encyclopedia pretty much confirms that Big Boss was resurrected from Outer Heaven due to the Snatcher Project.
Convo with Kasler.
Kasler: Big Boss...
Kasler: There's not a mercenary in the world who hasn't heard of him. He's a like a god, a living legend.
Snake: I already know all that! I need new information!
Kasler: OK, OK... but this is only a rumor, understand? Three years ago, when Outer Heaven fell, Big Boss was seriously wounded. He almost died...
Kasler: He lost both hands, both feet, his right eye, and his right ear. But somehow... he survived.
Kasler: Then an Eastern bloc despot took an interest in him. Probably couldn't resist getting his hands on a soldier of Big Boss's caliber.
Kasler: They decided to use Big Boss as a guinea pig in Madnar's Snatcher project.
Kasler: I don't know the details, but apparently it involved turning him into a cyborg. Now he's half man and half machine. Hard to believe, I know.
Kasler: But if it's true, Snake, you're way out of your league. None of your techniques is going to so much as put a scratch on him.
Kasler: Snake... give it up...There's no way you can win this time...Over and out.
Check out some sources for this theory:
http://mgsforums.com/topic/7511571/1/
http://thesnakesoup.org/?section=myths&content=bbsnatcher
http://metalgear.wikia.com/wiki/Project_Itoh