premise1: Person with a red bandanna is skateboarding down a pole with buildings in the background.
premise2: A young man dressed in classic grunge gear grinds a rail on his skateboard.
premise3: A man skateboarding outside balancing his skateboard on a beam.
premise4: Skateboarding grinding in a bootleg skate park.
premise: Person with a red bandanna is skateboarding down a pole with buildings in the background. A young man dressed in classic grunge gear grinds a rail on his skateboard. A man skateboarding outside balancing his skateboard on a beam. Skateboarding grinding in a bootleg skate park.
hypothesis: A skateboarder doing a trick.