Congrats on getting to see a wild black bear even up that close while hiking!! I spend a lot of time, and have for decades, on foot in areas black bears frequent. Now and then I get to watch them BEFORE they sense that I am nearby -- much more often I only hear/see them dashing away. A few times I have watched them for maybe 15 minutes, before they got close enough that a wind eddy took my scent to them -- then they made a max speed dash away. A bear's furry, bouncing-ball butt is a comical sight!! These rare times have all been in fall, when bears were feeding on wild berries.

Mamma black bears with cubs I have only seen from roadside. I don't worry much about bears, unless on horse back -- then you end up with a very agitated horse and plenty to do to keep horse under control and get it away from bear scent.

That "150-lb" black bear is hardly a cub, more like a cub from last year or earlier, and I would not expect mamma bear to even be nearby, much less attack. I have never heard of papa bears being protective of cubs, more like to attack and eat them.

Black bears getting into camp are a very different matter. If you have properly kept food odors and actual food from enticing bears, it is very unlikely you will have a bear problem of any kind. Bears visiting camping sites where they have previously found food can be a serious concern.

In past decades I have often kept a shotgun with large buckshot or slugs at hand in camps where there was a really potential for visiting bears. Other times the gun has been a heavily loaded Ruger SA 45 Colt or 44-40 at hand. Currently, the gun would be a 357 Mag with 180 grain Nosler Partition bullets at about 1000-1100 fps. Sometimes this is a Ruger Blackhawk with 4 5/8 inch barrel, sometimes a S&W M60 with 5 inch barrel. I can shoot either accurately one-handed, either hand, with fairly rapid follow up shots. At point-blank range, that 180 grain Nosler will penetrate deeply and expand. I prefer the M60 because of its DA capability, essential in close range, extreme situations. If bear is not actually at very close range, why are you shooting?

Niklas