This can be different for each person you ask
one reason is you can play the book out how you want to, imagine the characters your way, what the place looks like, etc. With a movie that is taken away from you. You are told how everything looks, and the movie/TV van leave out many stuff from the book
Answer: It helps foreshadow what is going to happen in the book and moves the plot forward. As he see though the eyes of others sometimes.
Explanation: I personally wouldn't because it seems terrifying and then I would be haunted by it.
That is in fact True. If you take slow deep breaths before anything stressful then you are very likely to be more relaxed.