Then a huge arm was raised, threateningly, over Harry's head.
At that particular moment, as though insensibly warned, Hazelton stopped, half-wheeling.

In the next second Harry bounded back just out of reach of the descending arm, the hand of which held something.

But in that backward spring Harry, in order to save himself from pitching into the water, was oblige to turn toward Reade.
"Tom!" exploded the young engineer.

"Flash the light here quickly!" In the instant, however, that Harry had sprung backward the figure had slipped noiselessly into the water to the left.

As Reade wheeled about, throwing on the light, he let the ray fall in the water to the right of the wall.