Skilled Bug Investigation Illustrated - Confirming it's really a problem

In a presentation titled Skilled Testers and Their Enemies, James Bach identifies the steps involved in skilled bug investigation:

The following post is part of a 13-part series illustrating those points using A Study in Scarlet by Arthur Conan Doyle.

How do we know this is really a problem?

Holmes’s user community was the police force. It was his problem because it was theirs:

“Still I recognized that justice must be done, and that the depravity of the victim was no condonement in the eyes of the law.”