It was this guy named 'BTSteindler'
I went to the theater mode, and saw there was a game of Tranzit, playing for 155 mins or something.
Found out that he is a glitcher. He did this glitch in the tunnel, he went out of the map, and all the zombies came to him.
He used the knuckles to kill the zombies.
He used the riot shield and the rpg shredders thingy to do the glitch. He was against the wall when he did it.
So my question is, does anyone knows a tutorial for this?
Sorry for my bad english...
Oh and, the #2 ranked zombie guy helped him to do the glitch. I don't remember his name.
NVM, FOUND OUT HOW TO DO THE GLITCH.
EDIT: This is the glitch he used