If that big brown box is a dumpster, I'm surprised (well sorta) that the fellow didn't dive in. I'd rather smell like garbage and even old diapers than get hit. That little bit of steel could make a difference (but it likely will get dented up).
Bison are ornery critters, anyway, and screwing around in the vicinity of a bull isn't the path to a long and happy life. That one had already invaded a picnic area, and wasn't even just ambling about.