Here are a couple clips from that Black Bear episode...
https://m.youtube.com/watch?v=LFYuQO8LF2A
https://m.youtube.com/watch?v=9PWHNIbS8cE
Bears are driven by curiosity, hunger, and fear.Any one of these can trigger an attack.
The best weapon to use on a bear is a rifle or 12 gauge shot gun with a rifled slug, but in a pinch a pole will do to keep the bear back, you poke, the bear stands up, you run.then repeat.Even better is a spear with a knife blade tied to a poll, and here is the best knife ( Cold Steel Bushman) to have in that regard:
The knife can be pole mounted locked on using a dry wall screw.
You can kill a bear with this as a spear, poke, bear stands up you let him have it in the heart or bread basket, thrust deep. On canoe trips its good to have a knife like this mounted on a strong straight spruce pole about 7 feet long. It can double as a pole for canoeing.