Marisol Heidrich, of Minot, North Dakota, contends that Mickelson Ranch and its owners are negligent, because they allegedly failed to take steps that would have prevented her injuries. Heidrich's attorney says she and her husband were traveling on their motorcycles to the Sturgis rally in August 2014 when a buffalo cow charged Heidrich, knocking her off her motorcycle and stomping on her head.