A manager at the Buffalo supermarket where 10 people were killed Saturday says she saw the suspect pretending to be homeless the day before the massacre. “He was acting like he was homeless and needed change,” Shonnell Teague told the New York Daily News in a Facebook message on Sunday. “He really was checking out the store.” The act appeared to be part of what authorities called a “reconnaissance” effort by white 18-year-old Payton Gendron prior to his attack targeting Black people. “He was in the Buffalo area, he was right in this area the day before,” Buffalo Police Commissioner Joseph Gram…