premise1: A BMX rider in a red and black outfit is jumping on his motorcycle.
premise2: A man in a red outfit jumps his motocross bike down the hill.
premise3: Someone in red on a bike is moving in midair.
premise4: A guy in red on a bike in midair.
premise: A BMX rider in a red and black outfit is jumping on his motorcycle. A man in a red outfit jumps his motocross bike down the hill. Someone in red on a bike is moving in midair. A guy in red on a bike in midair.
hypothesis: A biker flies through the air.