The Park Rangers at Yellowstone (and you don't need anyone to say this) tells people to keep their distance but a family from Florida obviously decided to not follow direction because the Bison ended up tossing their teen daughter in the air and it looks insane. The incident occurred near Observation Point Trail, in the area of Old Faithful Geyser.
Injuries of tourists by bisonand other wildlife occur regularly in Yellowstone, which gets about 4 million visitors annually.