The scene is taken from a part in the book where one of the many malevolent mutations is revealed. Attached to it, if memory serves correct, is an innocent bystander getting drained to a pulpy mess of its former self in order to provide strength and power to the mutation, allowing it to grow larger and have a greater horrific influence in the unsuspecting world.
If you've not read Michael Shea, I highly recommend him. He has a great style of prose that is elegantly poetic and a joy to read. He's got a firm grip on telling a tale with a punch and pulling out surprises that make you delve deeper and more insanely into his realm of the fantastic. Shea knows how to keep mood prevalent and effective which I find to be the first and foremost mark of success with genre fiction.
He attended the H.P. Lovecraft Film Fest in Portland Oct. 2010 as a guest and I had the distinct pleasure of hearing him read some of his works and was able to get some books signed as well. Without a doubt, a very nice and talented fellow.