Looking at this now - it looks like there is only one storm.
The buggy beats out the storm and then as Shaw gets off, she is blown away when it finally reaches the ship.
Looks like the temple self-destructs - which would be a good explanation for that huge explosion we saw recently in the latest TV spot. She gets blown away and as Vickers said before - she is closing the bay doors in 15 minutes. I am guessing she gets blown away, the ship takes off, and Shaw is stranded. Over the intercom she tries to persuade Janek to ram the alien ship while Vickers commands him to go home. Janek makes the right call and goes to ram the ship while Vickers rushes to the escape pod. The escape pod lands near where Shaw is and they both try to escape the falling debris together.
As for the struggling Fifield - here are some leaked photos from awhile back. Notice that he is outside the ship w/o a helmet. Other ppl are at the bay with helmets and flame throwers.
You can't hurt LMG with fire - he's already smokin' hot.