I am specifically referring to "What exactly is the circumstance of this specific event in book X".
An example would be: How did Ender kill this character?
Basically, the type of question that are fully and easily answered by taking the book and reading the relevant chapter.
I am only referring to things which are obvious to a typical random reader, NOT requiring some special subject or universe or other knowledge.
UPDATE: Please note that the question that prompted this discussion merely seemed to be of the type "What exactly is the circumstance of this specific event in book X" that I'm talking about due to poor wording by OP. After a wonderful edit by Tony, it became and actually interesting and unquestionably on-topic one.