I was going to keep going, saying, then you get to the comprehension and retelling in their own words.  Then you get to where some people say, "a good reader can visualize the story they're reading".  Or when you can get lost in a book...
Then I realized I missed something with my reading skills from your first post.   Congratulations on your son starting to read!

Youth lives by personality, age lives by calculation. -- Aristotle on a calendar