Great pics Battue. Can't say that I've run into a bear yet while birdhunting.
Not all that uncommon here in Pa. Once in late Grouse season, followed a set of Grouse tracks to a blowdown. No Grouse, but the Dog started barking. Looked hard, and down in a depression was Blackie. He/she slowly raised it head-at which time, I jumped back-but then just as slowly laid it back down.
We moved off and let him be.
Couple other times we have crossed paths. Once in Spring turkey when I inadvertently got between a Sow and Cubs. This involved some teeth snapping, but I backed off and they went on their way.
Another time Dog put two Cubs up a tree and wouldn't come. The Sow sat down and watched about 50-60 yards off. Finally I had to go and get him and she continued her sit. Got him away, stayed back and watched. They finally came down and off all three went.