The contestants had traversed but half the width of the arena returning to their cells when a sudden scream, ringing out behind them, caused them all to turn. Von Harben saw that the disturbance came from the imperial loge, but the scene that met his startled gaze seemed too preposterous to have greater substance than a dream. Perhaps it was all a dream. Perhaps there was no Castrum Mare. Perhaps there was no Validus Augustus. Perhaps there was no--ah, but that could not be true, there was a Favonia and this preposterous thing then that he was looking at was true too. He saw a black man holding Caesar by the throat and driving a dagger into his heart with the other, and the black man was Gabula. It all happened so quickly and was over so quickly that scarcely had Caesar's shriek rung through the Colosseum than he lay dead at the foot of his carved throne, and Gabula, the assassin, in a single leap had cleared the arena wall and was running across the sand toward von Harben. "I have avenged you, Bwana!" cried the black man. "No matter what they do to you, you are avenged." A great groan arose from the audience and then a cheer as someone shouted: "Caesar is dead!" A hope flashed to the breast of von Harben. He turned and grabbed Mallius Lepus by the arm. "Caesar is dead," he whispered. "Now is our chance." "What do you mean?" demanded Mallius Lepus. "In the confusion we can escape. We can hide in the city and at night we can take Favonia with us and go away." "Where?" asked Mallius Lepus. "God, I do not know," exclaimed von Harben, "but anywhere would be better than here, for Fulvus Fupus is Caesar and if we do not save Favonia tonight, it will be too late." "You are right," said Mallius Lepus. "Pass the word to the others," said von Harben. "The more there are who try to escape the better chance there will be for some of us to succeed." The legionaries and their officers as well as the vast multitude could attend only upon what was happening in the loge of Caesar. So few of them had seen what really occurred there that as yet there had been no pursuit of Gabula. Mallius Lepus turned to the other prisoners. "The gods have been good to us," he cried. "Caesar is dead and in the confusion we can escape. Come!" As Mallius Lepus started on a run toward the gateway that led to the cells beneath the Colosseum, the shouting prisoners fell in behind him. Only those of the professional gladiators who were freemen held aloof, but they made no effort to stop them. "Good luck!" shouted Claudius Taurus, as von Harben passed him. "Now if someone would kill Fulvus Fupus we might have a Caesar who is a Caesar." The sudden rush of the escaping prisoners so confused and upset the few guards beneath the Colosseum that they were easily overpowered and a moment later the prisoners found themselves in the streets of Castrum Mare. "Where now?" cried one. "We must scatter," and Mallius Lepus. "Each man for himself."