As you've read several times already, the chance of being attacked by a black bear in the fall are slim. However, your question was what you should do if you are attacked. I've read of many different ways to handle this, but what I've read/heard most is if it's a black bear - fight back. If it's a Grizzly - play dead.

If you are confronted with a black bear that doesn't seem to want to leave the area, you should slowly move away. Don't make any movements that could possibly show aggression. If the bear chases (which is unlikely in the fall), I've heard that if you run, and drop something as you run away (back pack, gun, anything) the bear may stop and sniff around what you dropped fora while.

Just so you know, none of what I have said is from experience, just some things I've read. For the most part, you don't have much to worry about this late in the year.

Just have fun and watch your path and you'll be fine.