When you fight the monster on the wall in the train dock, start with the shotgun atachment. try to have at least 6 to 10 shells. When the arm swings across the area,wait until the hand stops and gets ready to swing, go to the other side of the area and wait. It will miss you. Next when it sticks up and starts to wind up, stay still until it stops then run to the left or right and just keep moving. It will only slam down 3 times. When you run out of shells pick up the granade launcher and stand in a corner and shoot 1 granade. Repeat steps as needed and if you run out of granades then move to the flamethrower.
More tricks, tips and cheats for this game are right here - Extermination cheats
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