premise: A man swinging at a tennis ball with a green sign that read findersport. hypothesis: A man practices serving to a friend with his tennis racket.
neutral: Just because a man is swinging a tennis racket or something does not mean that this is simply practice. A man practices, yes, but this could be a game in Earnest. Also there is no guarantee that the person he is playing or practicing with is his friend. It could be a stranger or a co-worker or a spouse or anything. He could be serving to his tennis teacher for all we know.