With cubs is not the only time to be concerned about black bear.
Two years ago i was scouting & checking game cameras in PA.
Following a game trail through the woods came accross some pine trees. Path went through them, (hole between the boughs) and i could see it was brighter on the other side indicating a clearing of some sort.
I ducked down & went through coming into a small clearing (about 25 yard diameter).
What i didn't realize was the 400lb black bear on the other side of the clearing that was as surprised as i was.
Much growling, drooling and jaw clicking ensued. Then it stood up, still growling (i guess more huffing than growling) & drooling.
Wherein i pulled my Walther PPS out.
Bear came back down on all 4s and took a step towards me.
I put a round in the ground in front of it.
Bear stopped & stood there, jaw clicking, drooling (god there was so much drool!!) and huffing at me.
I slowly backed out of the opening i came through and beat feet outta there!
Now i carry a rifle when i'm in the area.
I still carry my PPS while archery hunting.