I'm concerned that Herzog's films are categorized as documentaries. It's becoming evident over his filmography that he often invents significant characters into his version of documentaries. See his ‘Minnesota Declaration' http://offscreen.com/view/herzog_documentary_fiction
Some of the characters are quite difficult to believe in this film and it's not even clear the audio is real - yes it can be found on the internet but is it something he created too to spice things up?
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Grizzly Man