Is there graffiti on the wall?
Answer the question with a single word or a brief phrase.

no

Is the skateboarder doing a trick?

yes

What color is the shirt?

black

Is the skateboarder wearing knee pads?

no

Is there a vehicle?

no

What is being worn on the knees?

nothing

What is the color of the wall?

blue

What is the name of the trick that the kid is doing?

grinding