Black bears are losing their shyness, attacks and even fatalities in the States have gone up over time. 25 people killed since 2000 I think it is.
It's true about the size part though. The one that got my dad in 91 was roughly 50 lbs smaller than he was. Probably about the same size as bear in that video. No cubs involved, just the bear bait he was tending. He did surprise it, was a windy day and bear probably didn't hear his approach. No retreat, no fake charge, just straight to work. He got plenty of claw wounds, but it was the teeth coming at his face and throat he was more worried about. He did a Peterson and used his hand to gag the bear (which didn't work out great for his hand), allowed him a chance to flip over on his stomach and play dead. I will never forget the image of my dad walking into the house asking for a ride to the hospital, his clothes all torn up and him covered in peanut butter and his own blood. Warden said it's possible that was the bear's first encounter with peanut butter, and saw my dad as another bear trying to muscle in on it.
Moral: take a jar of peanut butter with you when hiking, throw it into bushes as diversion if charged