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This isn't vital to the gameplay; I'm being very picky.
IHM Version: 1.1
I'm at the end of the level by the safe room.
There's a wall to the right with some sandbags, a sign and a lamp. From standing on the sandbags, you can jump on top of the sign and onto the wall (with the barbed wire). You can walk along the edge of the wall and get as far as the post, where you can watch the horde spawn. You can still be hit..