Playing L4D2 The Wrong Way- Hoping For A New Mutation?

The survivors have to make their way to the saferoom- last one there is a rotten egg! But wait, there's a twist, the survivors can't do it by themselves, they'll need a little help from their friends, the Jockey's in this fan made racing game called Jockey Racers! Could this be the birth of a new mutation?

http://kotaku.com/5532974/jockey-riders-playing-left-4-dead-2-the-wrong-way-looks-so-right