That boar was ailing. Probably hit by a car.
Yeah, there was something wrong with it, I think.
Appears the bear took advantage of a road-kill that wasn't killed.
I'd be pretty damned impressed with a bear that could take down a boar on it's own.
Bear are comparatively slow in a confrontation of that sort.
Not impossible, but improbable.
On the other hand, a black bear just emerging from hibernation can be overly confrontational with just about anything.