The author is the origin of the text. And when you are examining the source it is possible that you could look for the author's purpose.
This is generally True.
This is because the stories were orally presented and each Scope had a way of telling them that was unique, and also they changed it themselves since it was impossible to recreate everything exactly the same in two different presentations.
Do is a command, in the past instructing.
Does is in the present, currently doing.
