But so long as Johnny reported every evening that all was well, the horse-breaking would go on.
It is a pity that he had not impressed these facts more deeply upon Johnny.

A pity, too, that he had not confided in Mary V.Because Mary V might have had a little information for her dad, if she had understood the situation more thoroughly.

As thoroughly as Tex understood it, for instance.
Tex knew that any suspicion on the part of the line rider at Sinkhole, or any failure on his part to report every evening, would be the signal for Sudden to sweep the Sinkhole range clean of Rolling R horses.

He had worried a good deal because he had forgotten to tell his confederates that they must remember to take care of the telephone somehow, in case Johnny was lured away after the airplane.

It had been that worry which had sent him out in the night to find them and tell them--and to learn just what was taking place, and how many horses they had got.