41mag,
I have no idea what the story is but my wild-a$$ guess is that the bear climbed up a tree..perhaps chased by people or dogs. The tree was hanging over a trampoline and the people thought "Gee, I wonder what happens when a bear jumps on a trampoline?" So they set up their camera and then somehow caused the bear to fall from it's perch.
Again, that's a complete and total guess because my first reaction to seeing it was the same as yours.
brad cook