I came face to face with this black bear at the Loft Mountain Campground off the Skyline Drive in the Shenandoah National Park, Virginia last October. I turned to return to my Airstream and he was there blocking my return. When he stepped behind the 5th Wheel I was able to get back.
The rangers told me that he was a 250 pounder and had been causing trouble in the campground and wouldn't stand down if confronted.
It's smart to give them their space, after all, it's their home, we're just visitors.