Clearchus turned his back upon them and gave a single glance at the wide sweep of water that eddied and gurgled at the foot of the great wall, how far below him he dared not guess. A javelin hissed past him and was swallowed by the darkness. With muscles as firm as steel, he took two steps forward and shot out from the dizzy height.
He heard the cry of astonishment and involuntary alarm from the soldiers behind him. The light of the torches flashed in his eyes, and then fled suddenly upward.
He looked down upon the wrinkled surface of the river. The impetus of his leap had carried him out beyond the slope of the wall, and he saw that he would strike the water as he had planned, instead of being dashed to pieces.
The rushing air blinded him like a mighty wind. He heard its roar in his ears. Mechanically he pressed the palms of his hands together below his head, and stiffened and straightened his body so that it might offer no surface of resistance in the plunge. Then he knew no more.
Faintly the cry of the guards floated downward. Their torches twinkled over the parapet. Chares, who, with aching arms, was clinging to the last few fathoms of the rope, looked upward. So did Nathan, pausing in his task of fitting a pair of oars to the rowlocks of a small boat that he had pushed out from the wall.
They saw the form of Clearchus as it shot downward from the sky. They saw it strike the water not twenty feet from them, leaving a circle of foam, with hardly a splash to mark where it had fallen, so straight and true was its descent.
Chares let the end of the rope slip through his hands and leaped into the boat. With a few rapid strokes Nathan brought the little craft to the centre of the widening ripple, where the bubbles were still rising. Both leaned over the gunwale, straining their eyes for sight of the body in the dark water.
A minute passed, and another, while they held their breath. Then Nathan uttered a cry.
"There he is!" he shouted, pointing downward.
It was only a glimmer of white under the ripple, which showed for an instant and was gone; but Chares plunged from the boat and disappeared beneath the surface. When he rose, he held the body of his friend across his arm, hanging limp and apparently lifeless. Nathan drew it into the boat and then helped Chares to his place in the stern.