It was a pair of handcuffs that produced this clicking, as they were snapped on McGinnis' wrists.
Realizing what had been done, and nearly sobered by the shock of surprise, McGinnis started back, and, raising his hands quickly, tried to bring the handcuffs down on Shadow's head.
Shadow started back in time to save himself.
Then McGinnis made an attempt to fly.
Shadow was too quick for him.
In less than a second he had drawn and cocked a revolver, and with one spring reaching McGinnis' side, he planted the muzzle against the villain's temple.
"Be quiet, unless you wish to die instantly!" Shadow sternly said, and the villain paused and stood trembling like a leaf.
McGinnis' head was more sobered than his body, and when Shadow suddenly tripped him, his feet flew out from under him, and down he heavily went.
Shadow seemed working in a systematic way, seemed to have planned everything exactly as it happened, for when he sprang on the fallen villain he held a gag in his hand.
At the revolver's muzzle McGinnis yielded, and permitted the gag to be placed in his mouth.