If you bring a couple of steel pans and hammers in buffalo land, just bang on the pan. It hurts the heck out of their ears. Works on bears too.
Wild animals are unpredictable. While there are many dumbarse tourists who foolishly approach animals, it is not at all unlikely that some Bison just might decide to go after someone 100 yards away for reasons only known to the Bison. Or Moose. Or Bear.....
Many stories and videos and photos and funny cartoons of stupid people at national parks.
Bison traps Yellowstone visitor in restroom ‘like a scene from a comedy,’ video shows
https://www.newsobserver.com/news/nation-world/national/article277289553.html