Cameron did not answer; he was busy looking and listening and running the car.
"Thunder!" exclaimed McGlory, as the scene opened clearer and clearer before his eyes, "there's a hole in the hillside—two holes, or I'm a Piute, for another just opened up."
"And the man's mounting the horse," said Cameron.
"And some one is coming through that hole in the hill. Sufferin' surprises! Why, it's Matt! Look, Cameron! He's pointing toward the man, and saying something. I can't hear what he says, but it's a cinch he wants us to follow the man."
"And it's a cinch we'll do it, too!" cried Cameron. "Pull that other revolver out of my hip pocket, McGlory. Don't use it, though, till I tell you to. The bare sight of it may be enough to bring the man to a halt."
Cameron had turned the car and was plunging across the prairie in hot pursuit of the fleeing horseman. The car was going five feet to the horse's one, and the pursuit was drawing to a rapid close.
"It's Siwash Charley!" announced McGlory.
"I'd about made up my mind to that," said Cameron. "He was shooting at Matt. It looks as though we had arrived just in time, McGlory."
As the car leaped and swayed across the prairie, the cowboy stood up, hanging to Cameron with one hand and waving the revolver with the other.
"Halt!" he shouted.