As with most things, including bears, there are no absolutes.
There are only statistical averages, which you can use to decide the probable best way to act in a situation.
If that fails to elicit the desired outcome, one should feel free to improvise.
Here is another article with regards to black bear attacks and Mothers and cubs, his one from the New York Times.
Study of Black Bears Finds It’s Not the Mamas That Should Be Feared the Most
http://www.nytimes.com/2011/05/11/sc...ears.html?_r=0
The study also found, contrary to popular perception, that the black bears most likely to kill are not mothers protecting cubs. Most attacks, 88 percent, involved a bear on the prowl, likely hunting for food. And most of those predators, 92 percent, were male.
“Mother bears, whenever they feel threatened or a person is too close, they act very aggressively,” said Stephen Herrero, the study’s lead author. “They make noise, they swat the ground with their paws and they run at people. They want to make you think that they’ll eat you alive, but they almost always stop.”
Colorless green ideas sleep furiously.
I'm sure there are exceptions and no one is saying to go test the bear's behavior.
Just correcting the record of black bears being super protective of their young, the truth is not only different, it's the polar opposite. And I've seen this behavior myself, I inadvertently got between a mother and her cubs in SNP, they all went up trees.
[QUOTE=
- Black bears have evolved over the last 400 years from a "fight animal" to a "flight animal" due to man.
[/QUOTE]
And if the humans they encountered today carried mace as frequently as our ancestors carried a guns, they might stay that way.