The bear comment is absolutely wrong. A grizzly that attacks you is attacking to eat you. A black bear will seldom attack, and then only if you have cornered either the bear or its young.
The bear advice is only recommended for Grizzlies (brown bears), who are territorial and will usually leave you alone once they think you are no longer a threat. Black bears attack people less often and are usually scared by humans. However, if they do attack it is usually because they see you as prey. Therefore you should try your best to get away once they are coming towards you or try to find a weapon and attempt to scare it away. But remember that black bears climb trees very well!
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