EAST RUTHERFORD, N.J. — A man who was serving in the Air National Guard died after he fell while snowboarding at an indoor ski park inside a New Jersey mall, officials and family members said. Peter Mathews, 24, of Bay Shore on New York’s Long Island, fell Dec. 8 as he snowboarded at the Big Snow American Dream, which is within the American Dream Mall in East Rutherford, his family told Newsday. Big Snow American Dream is an indoor skiing and snowboarding facility within the mall at the Meadowlands Sports Complex.