Choices:
All: Throw the briefcase and try to sneak past in the distraction.
You toss the briefcase out the window of your car as far as you can. It lands in the tunnel with a loud thump and slides across the hard-packed dirt. You hear the two unfortunate subway passengers grunt inquisitively and shuffle off in that direction. With that, you move out to the opposite side of the train and hurry forward away from the area.
You are not far off when you clamber up and over another flattened car and come face to face with a bloody horror on the other side – Crawling toward you over the flattened subway car is a corpse, its lower half fully torn away at the waist and trailing innards behind. The thing is still alive, frothing bloody foam at the mouth and snapping hungry jaws at you!
You then...
Find a large stone to smash its head in with.
Flee through the wreckage to the front of the subway train (it can’t follow very fast).