Anchor: With the dam in the distance, the boy piggy backed onto the man in the black jacket holding a frisbee.
Entailed: The boy is outside.
Contradiction: The boy is alone with a ball.
Contradiction: The boy is walking.
Contradiction: They are playing football.
Contradiction: In outer space a man is piggy back riding on a alien body.
Contradiction: The man piggy backed on the boy.