Sit or stand with your arms quietly at your sides (eating lunch).
To most forest animals, you look like the front end of a deer/moose/elk/etc.
Raising your arms is lifting your front legs and that's a threat.
That's how you got away with your encounter.
Many bow hunters here stalk out in the open. They hold their bow on top of their head = antlers.
Laugh all you want, it works.