I don't do the folklore stuff, but I can agree on one thing you touched upon. I've stated on here several times in the past and have known this for years now that it's fully apparent that they don't know we can't see them in the dark. The crouching and hiding/concealment behaviors in the darkness fully shows this. I've observed this behavior with both infrared and thermal cameras. They like to stay hidden with both mediums. I used to think that since it's widely believed they can detect infrared light, that they stay hidden because they saw the infrared light beaming at them from the night vision. But since thermal gives off absolutely no light at all, they still exhibit this behavior when observed with a thermal camera. So they simply don't know we can't see them in the dark and they stay hidden because they think we can see them.. Also, I'm sure they can tell if you're looking in their direction with any type of camera day or night, since you're looking their way they notice you looking towards them and will stay concealed more. But this only accounts for some encounters that people have, some Bigfoot are just brazen and doesn't care about staying hid.