If the story is true, then wow! what an terrifying event - like being in the middle of a real life horror movie. If its not true, then someone is waisting their talent and really should be writing books.
The guy who wrote this back in 2004, came back last month to the message board to say this, among other things:
"The Cowman of Copalis Beach is being published in a compendium of Bigfoot tales by an author named Linda Coil. I gave her the the one time use rights to publish the story in her upcoming book. I am currently working on turning the story into a screenplay."
http://www.bigfootforums.com/index.php?showtopic=5530&view=findpost&p=445852