And the horror that fascinated him and gave such dreadful unity to his tales is often the unavoidable conflict of the self by a perfect justice, the exposure of a guilty act in a form that makes its reveal a falling back of the mid against itself.
请问划线部分如何理解？ 这里这个mid的意思是？
你的句子选自“纽约书评”网站的一篇文章。
详细情况参见：
http://www.nybooks.com/articles/2015/02/05/edgar-allan-poe/
文章的题目是：On Edgar Allan Poe《论埃德加·爱伦·坡》（十九世纪美国诗人、小说家和文学评论家）。
这篇文章曾被江苏四校用作联考英语考试试题中的阅读理解篇目。联考考试试题本身有误，可能是以讹传讹是什么原因吧，你提供的句子也有误。应该是下面这个句子：
And the horror that fascinated him and gave such dreadful unity to his tales is often the inescapable confrontation of the self by a perfect justice, the exposure of a guilty act in a form that makes its revelation a recoil of the mind against itself.
【翻译】让他着迷而且给他的故事带来这样完整统一的那种恐怖，常常是合乎法律的正义所带来的不可防止的自我冲突，对犯罪行为的揭露，所用的展示方法是背叛自我的心灵退缩。
【简析】最难理解的部分是：the exposure of a guilty act in a form that makes its revelation a recoil of the mind against itself.
1. the exposure of a guilty act：对犯罪行为的揭露
2. in a form...用某种方法
3. that makes its revelation a recoil of the mind against itself：定语从句修饰方法form，that关系代词。
4. makes its revelation a recoil of the mind against itself：make +名词（宾语）+名词（宾补），让...成为...
5. a recoil of the mind：心灵的退缩
6. against itself：与自己相背而行，作定语。
