ABBEVILLE — Even as the 14-hour armed standoff with authorities was beginning early Monday morning at her barricaded home a mile or so away, a helpless Rita Bixby was turning to her own decades-old weapon of choice: The law. Holed up inside her son’s Abbeville Arms Apartment with her adult disabled son, the 71-year-old decided to fire off a call to the state Attorney General’s Office. She left a voice mail message — strident, but calmly worded — still asserting the family’s legal right to land the state department of transportation had bought in the mid-1960s to widen S.C. 72...