Louis Sachar used short, dramtic sentences to show clearly what Bradley is feeling at that time. But instead of just writing "His stomache was churning", he used a simile "There were pain and agony, like a knot in his stomache..." Sachar wrote a word"tichter" betweem the 3 sentences, which was a speach from Carla that Bradley remembered, to make the reader desperately wants to know what Bradley is going to do next. They could also understand that Bradley could not forget Carla, although he tried to but it cause him pain.

That's what I think makes it so good, I haven't think of other ideas yet on what makes it so good. When I read up to that part I agreed that it was a brilliant sentence but could not know how..-_-