premise1: The boy is jumping a skateboard down the steps, surrounded by graffiti covered walls.
premise2: A skateboarder has kicked his board up onto its back wheels in an indoor skate center.
premise3: A man performing a trick on a skateboard at a graffiti covered skate park.
premise4: A man wearing a gray shirt is doing a skateboard trick on stairs.
premise: The boy is jumping a skateboard down the steps, surrounded by graffiti covered walls. A skateboarder has kicked his board up onto its back wheels in an indoor skate center. A man performing a trick on a skateboard at a graffiti covered skate park. A man wearing a gray shirt is doing a skateboard trick on stairs.
hypothesis: A skater jumping.