premise: A skateboarder is performing a grab trick while hovering above a ramp, which is located within a city. hypothesis: A skateboarder is in his backyard wrestling with his friends.
contradiction: Performing a grab trick on a skateboard and wresting with his friends are two different actions.|contradiction: A skateboarder can't be performing a grab trick at the same time he is wrestling with his friends.|contradiction: A person can not be wrestling while performing a trick.