How do the narrative voice and the sentence structure of the text change when the story shifts from descriptions of the Clutter family to descriptions of Hickock Perry Smith?

Capote's prose turns much more uncultured and abrupt. Gone are the small town nostalgic imagery and tone of the Clutter farm and family before the murders. Dick and Perry have a more visceral unrefined tone to them,

‘Deal me out, baby,’ Dick said. ‘I’m a normal.’ And Dick meant what he said. He thought of himself as balanced, as sane as anyone—maybe a bit smarter than the average fellow, that’s all. But Perry—there was, in Dick’s opinion, ‘something wrong’ with Little Perry.” Pg. 108