One time a person I know had an arrow nicked while walking with another, his broadheads came in contact with the other guys bow and cut the string.

Ended one guys hunt, but no one was hurt.
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Another story involves a guy who is a prominent name in the archery community, and NBEF instructor..
Elk hunting with us and told to walk a certain trail.
A short distance and an elk crosses in front if him, pulled an arrow out of his quiver but before he could Nick it, the elk was gone.
He put the arrow back in his quiver and another elk crosses...
Third time it happened, he decided to keep one nocked.
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I usually hunt with one on my string, but when around other hunters, or navigating challenging obstacles, I keep them put away.
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Safety is paying attention, and adapting.