Objects in the image:
category: skateboard
category: skateboard
category: person
category: person
category: skateboard
category: person
category: person
category: person
category: person

Guessing-game dialogue about one of the objects:
q: is it a person?
a: Yes
q: is it one of the racers?
a: Yes
q: is it the racer still on his board heading downhill?
a: No
q: is it the racer with green pants next to the white sign?
a: No
q: is it the racer with the green arms on his suit?
a: Yes