I'd be pretty surprised if Cody has convinced the lemmings to march en masse, and barefoot, off a cliff. Dual Survival is "Big Time Wrestling" and he's been very clear about that in interviews. I have read his books, and one of my best friends trained with him for several months in the Arizona desert. I can promise you he really knows his sh!t.
_________________________
“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman