Sorry, I missed some of this thread and didn't realize there was positive ID.
Butch LeFevre and I were very friendly during the time he was tracking this cat. He had on at least 20 occaisions found that the cat had evaded him seeing it, even with night goggles, when he had passed within 50 feet.
I agree that a big cat scream is something you won't forget. I've seen very large coyotes in the Catskills, compared to those I've seen out west. They looked real well fed for wild animals.