Interesting enough story.
I approved the site promotion as you sound sincere in your search for answers.
I'm not sure anyone can give you as definative answer but those most common ones would be...
Some one messing with your head.. LOL I hope not
Or the creature you indicate that was witnessed is replacing the limb lean to as some sort of marker.
Here's where the speculations and romance of Bigfoot comes in....
Territorial? Directional? Invitation? who knows.
Might be one of your son's friends...vagrant..or a Indiana Bigfoot.
Good Luck
Robert
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