Everyone is overlooking one thing in the trailers.

RabidChinchilla, Never saw the hand catching the other side. I always assumed, "We can't let this go to Earth", so she just jumps on it.. lol.

If you want to get off, why would you even jump to the next receding segment? It's useless! just stand still and let yourself be taken to the edge and then step up to solid ground, that's what I would do, but my name's not Shaw or Vickers. Unless the segments are meant to open just a bit and then tilt vertically or something like that.

she makes it across, rolls and lives, finds out from David8 about a crew member with "her own agenda" and murders Vickers to stop her form obtaining some Creature DNA for Ms. Yutani {who is still pissed about losing her lawsuit not so long ago in this timeline and wants to fabricate the "ultimate bio-mechanical weapon} and scoops up Jonsey as the two make their way back to earth and to warn mankind that everything it has been taught and handed down, generation after generation and that everything mankind has believed regarding it's own origins is and was wrong, We were created by some Nasty Creatures from only they them selves know where in Outer Space and now they're really really pissed at Mankind !!! We stole they're Fire ! Roll Credits !!!

I always thought whlie watching the trailers that she wont take it to jump over the edge because of the moving pieces below..the gaps are getting bigger and bigger.. as long as you dont go to the sides you [i]must[/i] fall down..