Coach and Louis from Left 4 Dead get trapped in Equestria. And the ponies seem to be taking it quite well to have two battered, covered in blood humans...Or do they? Meanwhile, back on Earth, the survivors have to find out what happened, and try to rescue their lost friends! But will they be able to get back? And, can the ponies stop the infection coming from the two, infected blood covered humans? (Warning: This story has cursing)