New Delhi, July 13 -- YELLOWSTONE NATIONAL PARK, Wyo. - Mike MacLeod had already raised his camera when the bull bison stopped rolling in the dust and fixed its attention on the campsite. What followed took less than three seconds. A 65-year-old grandfather was thrown eight feet into the air, and the footage MacLeod captured became one of the more visceral reminders that Yellowstone's most common large animal is also its most reliably dangerous.

The attack occurred July 10 at a campsite inside Yellowstone National Park in Wyoming. The victim, whose name has not been released, was hospitalized following the incident. NBC News first reported the encounter.

MacLeod's video, shot from a professional's vantage point, shows the bison in an ag...