Suddenly and silently he leaped forward and downward upon the broad shoulders of his prey. In the instant of contact his fingers sought and found the man's throat. The weight of the boy's body hurled the black heavily to the ground, the knees in his back knocking the breath from him as he struck. Then a set of strong, white teeth fastened themselves in his neck, and muscular fingers closed tighter upon his wind-pipe. For a time the warrior struggled frantically, throwing himself about in an effort to dislodge his antagonist; but all the while he was weakening and all the while the grim and silent thing he could