Anchor: A kid wearing a helmet, elbow pads& knee pads on a bike is performing a jump off a rock in a dirt covered area.
Entailed: A kid performing tricks outdoors on his bike.
Contradiction: A boy doing tricks on his skateboard.
Contradiction: I just cannot get it to turn out how I wanted. 
Contradiction: There are multiple people present.
Contradiction: Nobody has a dress
Contradiction: A boy is doing some physical activities