“...people should stay more than 25 yards away from bison.”
Those beasts can run 35+ MPH, so they’ll close the distance very quickly, unless you’re a 4 sec/100yd sprinter.
Bison don't see very well past forty or fifty yards so anything that gets too close is perceived as a threat and they respond aggressively. That's how they've survived for thousands of years. That was one bison and one human. Imagine a herd of them.