(adsbygoogle = window.adsbygoogle || []).push({}); So... Here's my theory

So you start the match, go down the first elevator, and then go to the debris in the defcon switch room. Buy it, then go down the stairs to the left, and go to the side of the stairs closest to the teleporter. I think the barrier right there should be low enough to do with TWO zombies, but I tried with one and it was impossible.

could be but i really doubt it cause of the recent hotfix

I thought the same thing, tried with two zombie and you don't get enough height. My next try is going to be two zombie on the table upstairs, I know it is a long shot but it would be awesome if worked.