Further up the trail, there is a moment when the sudden revving of a snowmobile's engines causes a couple of bison to panic. The bison abruptly turn and run - again, they were very lucky that the bison didn't feel threatened enough to charge at the snowmobile instead.
However much these people paid for their tour, whether this is their vacation, and even the intent of the tourists are all immaterial to the bison. These are wild animals, prone to sudden changes in mood.
They're not singing robot children on "It's A Small World," and they're not on the side of the trail for the tourist's amusement. Please be careful and respectful around wild animals.
See the whole video below, and be aware that it contains some foul language.