The bowbunters standoff. I have been in that exact situation albeit with deer so many times it is not funny. (Tracking)It is so frustrating. Cool video, 10 points to the lady fo keeping her cool.
It's interesting that "human" is not a mental model -- aka search image -- that the bull recognizes immediately. Not enough of them in his environment growing up to form that model/image. If she was moving, it would respond to movement. As it is, for the first few seconds, he just sees a tree or tall stump. Then comes that "Oh, s***" moment, when he gets it.
It's likely that it was scent not sight that finally gave her position away. They have more olfactory receptors than a bloodhound, some specialized for certain scents. Even smell in stereo. http://www.outdoorhub.com/stories/2016/03/15/science-scents-well-can-deer-smell/
I watched this video several more times. Note the 4 deep breaths the Elk takes before he bolts off. He was called in and when the scent didn't match with what he was hearing, he took off. These guys live by scent.
