With R1 and one out, B3 hits a fly ball to right field. R1 who was stealing on the pitch believes the ball will drop in and heads for 3rd. As he gets near there, the coach screams for him to go back to first since F9 caught the fly ball. R1 turns around to go back, but before he reaches second base, F9 throws the ball to F4 who steps on second base and looks at the umpire implying that he is making an appeal. R1 having touched second base, runs back to first and stands on the bag. Is R1 out on the implied appeal or must either he or 1st base be tagged (Fed and OBR)