The left
From Create Your Own Story
You bust throught the vent on the left and climb down. You find yourself in a bright room with white walls and broken cardboard cut outs with large bullet holes in them. This must be some kind of target range. At the other end of the room is a RED HWG who is shooting wildly at all the cut-outs that pop up. You're behind a wall and so far, safe from a vicious death, but then you see a RED Scout jumping around hitting targets that the heavy can't reach. It will only be a few seconds before he sees you hiding. Better think of something fast.
Shoot the RED HWG from a distance
Wait for the RED Scout to approach you, then strike.
Use the cardboard cut-outs as cover, then when you get close, kill the RED HWG.