A couple of things come to mind as I read this.
1. It is amazing how changing one's shape contributes to camouflage. My father hunted deer wearing a camo poncho and hat. When he sat down, he became a bump on the ground or a bush. No legs or arms to give a visible human outline. We tend to look for shapes and colors of what we expect to see. On different occasions he sat in the shade of a sapling beside a trail as animals moved VERY close to him. Once, he sat as a pair of coyotes stood inches from him. The male looked around Dad's head to see what was behind him. If BF curls up and changes it's shape, it becomes even harder to recognize because we aren't looking for bushes, rocks, or stumps.
2. I have twice 'lost' deer that were within feet of me. A friend and I were hunting and a buck bounced into a hayfield of waist high grass and dropped to it's belly before we could get off a shot. I stayed put to direct my friend who walked into the field to scare the buck out and, hopefully, we'd another shot. I could see the exact spot the deer dropped into. There was only grass for a hundred yards in each direction. We never did find that deer. Of course it moved on it's belly and managed to get away without us seeing it. My point is, if a stupid deer can do that, why are we surprised when something with some brains pulls it off.
17x7