Gurgling sounds came from her.
Penrod's expression had become grim.

He offered no second protest, mainly because he, likewise, would not waste his breath, and if he would, he could not.

Of breath in the ordinary sense breath, breathed automatically--he had none.

He had only gasps to feed his straining lungs, and his half-trot, which had long since become a trot, was changed for a lope when Mr.Blakely reached his own best burst of speed.
And now people stared at the flying three.

The gait of Margaret and Mr.Blakely could be called a walk only by courtesy, while Penrod's was becoming a kind of blind scamper.