Final answer:
The provided excerpts are not related to John Proctor or 'The Crucible', hence an answer regarding why Proctor is angry after signing a paper cannot be derived from them.
Step-by-step explanation:
The student seems to be asking about a scene from Arthur Miller's play The Crucible, where John Proctor is angered after signing his confession. However, the excerpts provided are not from The Crucible, but rather from assorted literary works that do not pertain to John Proctor or The Crucible. Therefore, I cannot provide an accurate response to why Proctor is angry after he signs the paper based on the excerpts given.