"Look, by God!" whispered Stahl hoarsely as they moved off. "There's a third!"
He pointed. Where the two had been standing something, indeed, still remained. Concealed hitherto by their bulk, this other figure had been left. They saw its large, dim outline. It moved. Apparently it began to climb over the rails, or to move in some way just outside them, hanging half above the sea. There was a free, swaying movement about it, not ungainly so much as big—very big.
"Now, quick!" whispered the doctor excited, in English; "this time I find out, sure!"
He made a violent movement forward, a pocket electric lamp in his hand, then turned angrily, furiously, to find that O'Malley held him fast. There was a most unseemly struggle—for a minute, and it was caused by the younger man's sudden passionate instinct to protect his own from discovery, if not from actual capture and destruction.
Stahl fought in vain, being easily overmatched; he swore vehement German oaths under his breath; and the pocket-lamp, of course unlighted, fell and rattled over the deck, sliding with the gentle roll of the steamer to leeward. But O'Malley's eyes, even while he struggled, never for one instant left the spot where the figure and the "movement" had been; and it seemed to him that when the bulwarks dipped against the dark of the sea, the moving thing completed its efforts and passed into the waves with a swift leap. When the vessel righted herself again the outline of the rail was clear.
Dr. Stahl, he then saw, had picked up the lamp and was bending over some mark upon the deck, examining a wide splash of wet upon which he directed the electric flash. The sense of revived antagonism between the men for the moment was strong, too strong for speech. O'Malley feeling half ashamed, yet realized that his action had been instinctive, and that another time he would do just the same. He would fight to the death any too close inspection, since such inspection included also now—himself.
The doctor presently looked up. His eyes shone keenly in the gleam of the lamp, but he was no longer agitated.
"There is too much water," he said calmly, as though diagnosing a case; "too much to permit of definite traces." He glanced round, flashing the beam about the decks. The other two had disappeared. They were alone. "It was outside the rail all the time, you see," he added, "and never quite reached the decks." He stooped down and examined the splash once more. It looked as though a wave had topped the scuppers and left a running line of foam and water. "Nothing to indicate its exact nature," he said in a whisper that conveyed something between uneasiness and awe, again turning the light sharply in every direction and peering about him. "It came to them—er—from the sea, though; it came from the sea right enough. That, at least, is positive." And in his manner was perhaps just a touch to indicate relief.
"And it returned into the sea," exclaimed O'Malley triumphantly. It was as though he related his own escape.
The two men were now standing upright, facing one another. Dr. Stahl, betraying no sign of resentment, looked him steadily in the eye. He put the lamp back into his pocket. When he spoke at length in the darkness, the words were not precisely what the Irishman had expected. Under them his own vexation and excitement faded instantly. He felt almost sheepish when he remembered his violence.