My theory is that this was a photographer attempting to get still shots during the filming. I have witnessed documentaries being filmed and there are usually photographers positioned in various areas. I really don't think this was a deliberate hoax but simply someone caught during the filming of the sequence
I recently participated in an e-mail group discussion on the topic of the origins of Crop Circles. After that conversation, I collected my various thoughts from this cyber chat, expanded upon it, and the following article emerged.