>When I'm exhausted while hill walking, I notice that I tend to drag
>my feet somewhat. I guess my tracks look different from when I'm
>energetic, so determining tiredness does not seem that unreasonable.
Yes, and 1) it happens in almost every Western I've ever seen, 2) high levels of tracking success may be magical, 3) people drop things, snag clothes on branches etc., which tend to make some inferences quite obvious.
Thom
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