Let's get acquainted!

if Ugluk hadn't shot Boromir

This doesn't follow from the text of the book; nowhere does it say that Boromir was shot by Ugluk (in the film, it was some Lurz, a former orc leader, who shot him), it simply states that Boromir was hit by a lot of arrows. But this is a minor off-topic comment:)

But overall, the post is correct:) And the comment about writing "fantasy" is also correct:)