Choking on her blood on the floor of Cabin Fever, Carolyn Tuft inched toward Kirsten, her mortally wounded daughter, to tell her that she loved her. Their faces close, she took her hand. Mother and daughter had been in the store for just a few minutes, not even at the Valentine's Day cards yet, when Tuft heard a "pop." They were laughing and browsing, and at first Tuft paid little attention. As the danger became apparent, she couldn't know if it was safer where they were or out in the hall. She walked over to the window to see...