There are two patterns within this story. The fist pattern consists of a smooth transition from a stressful to a peaceful situation. The second consists of transitioning between events and emotions that come from prisoner Brille and warder Hannetjie.
I believe the author used these two patterns to show us the story's mood and its plot.
The first two sentences are a perfect example of the transition between stress and peacefulness; "Scarcely a breath of wind disturbed the stillness of the day and the long row of cabbages were bright green in the sunlight." and the sentence following "Large white clouds drifted slowly across the deep blue sky." Imagery is also evident in these two sentences. Another transition between stress and peace would be in on page 235 in my packet. "The bashings, biting and blood were to operate in full swing until he came home." and "...he never failed to have a sense of godhead at the way in which his presence could change savages into fairly reasonable human beings." It went from physical abuse to telling about him being gifted enough to change people in a positive way.
The transition between Brille and Hannetjie are evident throughout the WHOLE story. "Warder Hennetjie whipped out a knobkerrie and gave Brille several blows about the head." then "That evening in the cell Brille was very apologetic." Even though the warder was brutal Brille was still the kind hearted man who cared for his "comrades."