flopsybunny:
when you rewrite you should focus on taking out all the things that are not the story
Which, said another way, is: About any passage, you should ask yourself, 'In what way does this add to the story?" and if the answer's 'None', then PRUNE IT.
But where do you draw the line? Descriptions of settings, or of character appearance; passages of dialogue; paragraphs of reflection; or even passages of narrative action can all be extraneous to 'the story' sometimes, yet they add to the overall effect and reader enjoyment.
My pruning ('how can I say this more concisely?') can reduce the word count by 10%, but only rarely do I excise a whole paragraph on the grounds that it's 'not the story'.
I fear that if we followed Mr King's advice too closely, our library would be a poorer place.
On the other hand, if you're reading a story and find yourself thinking, "Oh for heaven's sake, dear Author, do get on with it, won't you?' (or perhaps, "Jeez! Move it, buster") then perhaps KIng's Law should have been heeded.