Wow!
I had a bear issue a few years back. I know it's still around, but it seems to have lost interest since I don't keep food in the coop or run anymore.
That's what they're mostly interested in.
I lost chickens to the bear, but it was kind of accidental. They freaked, he swatted, they died. Right at dusk too. Had a long talk with the game warden and there are easier ways of dealing with it than shooting.
I could have technically shot him, but the paperwork afterwork would have been a nightmare. And think of the hole if you go the SSS route!!! Keep the food away from your coop. Collect eggs before you go to be, and you'll probably be okay in the future.
As for bear/human interactions. Unless they can't, 9 times out of 10 they'll run. It'd surely suck that one time, though, wouldn't it.
Mark