Oooooh yeah pile up glitch! Skip to 19:37 for the glitch.
Let the zombie walk over the downed guy while being crouched and it should push him under the map after a few tries.
When the downed guy is under the map use that phoenix up and then he needs to get into the position shown in the video.. after that you are good to go.
Have fun guys :)
Tip: Try to stay back at the shotgun wall buy and do not walk on top of the head of the player under the map.
Credits to my friend Emulations/|||||||||||||||||||.
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