The two servitors quickly obeyed.
The big stone was just tottering as their rifles cracked.
Several of the greasers were exposed and two of them fell.
Crack—ack!
Again the rifles spoke.
This time two more fell. But the big bowlder was coming.
Frank meanwhile had seized the brake and turned the Steam Man’s course to the right.
He was not a moment too soon.
Down came the big stone like a whirlwind. The Steam Man escaped by the merest hair’s breadth.
The stone passed so close to the cage that the wind nearly took Barney’s breath away, he being on that side.