The semantic fields that Harper Lee uses in the noval are ones that make the scene tense and also unnerving because the two words that link are creepy and shivered. Most of the time these words both mean that someone is afraid or nervous because they are either remembering something bad (or scary) or that the thing they have remembered was happening again and possibly getting worse. This altogether creates tension because the reader is on the edge and wanting to know what the character is remembering and also it creates tension during the scene in the book.