NEW ORLEANS—When Saints quarterback Jameis Winston could no longer walk on his own, his New Orleans teammates rose up in dramatic fashion to knock off Tom Brady and the defending champs. P.J. Williams intercepted Brady and returned it 40 yards for a touchdown with 1:24 left, helping New Orleans seal an eventful but potentially costly 36–27 victory over the Tampa Bay Buccaneers on Sunday. Winston injured his left knee during a scramble early in the second quarter when pulled down from behind by former LSU star Devin White, who was flagged for a horse-collar tackle. “I think it’s significant,” said coach Sean Payton, adding that he cried when he saw Winston in the locker room. “He felt something and is on crutches right now … When he got up and then had to go back down, you were a little concerned.” Backup Trevor Siemian took over for Winston and completed …