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(At least I hope it was map3, I only played it once.)
After firing the big cannon and surviving the onslaught of infected, it looks like you're supposed to jump over the barricades towards where the cannon is aimed. My bots certainly were standing in the barbed wire, as if waiting for me - but I couldn't. As if there was an invisible wall above the barbed wire. Even when I was trying it from the top of the cannon.
I thought perhaps that isn't the way to go, and tried to go around the rocks to the left, but what seems to be a narrow path at first, doesn't let you through. Somehow, I managed to slip down towards the water, and ended up stuck. See screenshot.
The Zoey bot fell down after me, but managed to get as far as the deep water, and was teleported back up on the flat ground.
I hope this makes sense.