That was all that was necessary. Ezra sensed in an instant the fact that he had become embroiled in what bade fair to be a tragedy and braced himself for action. He knew that he had no chance for holding off both men, particularly as he did not care to precipitate gun play, but there was the hope that he might divert them until the girl escaped. As the first of the two men leaped toward him, Marks swung straight for his jaw, but his assailant ducked with what was almost professional rapidity and the blow was only a glancing one. Before the operative had time to get set the other man was upon him and, in utter silence save for their labored breathing and dull thuds as blows went home, they fought their way back to the far side of the street. As he retreated, Marks became conscious that instead of making her escape, the girl was still behind him. The reason for this became apparent when the larger of the Chinamen suddenly raised his arm and the light from the open doorway glinted on the blade of a murderous short-handled axe--the favorite weapon of Tong warfare. Straight for his head the blade descended, but the girl's arm, thrust out of the darkness behind him, diverted the blow and the hatchet fairly whistled as it passed within an inch of his body. Realizing that his only hope of safety lay in reaching the opposite side of the sidewalk, where he would be able to fight with his back against the wall, Marks resumed his retreat, his arms moving like flails, his fists crashing home blows that lost much of their power by reason of the heavily padded jackets of his opponents. Finally, after seconds that seemed like hours, one of his blows found the jaw of the man nearest him, and Marks wheeled to set himself for the onrush of the other--the man with the hatchet. But just at that moment his foot struck the uneven curbing and threw him off his balance. He was conscious of an arc of light as the blade sang through the air; he heard a high, half-muffled cry from the girl beside him; and he remembered trying to throw himself out of the way of the hatchet. Then there was a stinging, smarting pain in the side of his head and in his left shoulder--followed by the blackness of oblivion. From somewhere, apparently a long distance off, there came a voice which brought back at least a part of the operative's fast failing consciousness, a voice which called a name vaguely familiar to him: "Sprague! Sprague!" "Sprague?" muttered Marks, trying to collect himself. "Who--is--Sprague?" Then, as he put it later, he "went off."