When you went to rob one of the nearby tombs, you did not know that the way back to the camp will be a problem. After you stole ancient chest, it triggered all the defense mechanisms in the area and all the way back is full of traps and obstacles. And since this is the only way to get to safety, you will have to take the risk going that way. Try to run as far as possible and get as many points, for which you can then unlock new characters. Have fun.