premise: a young man jumping through the air near a staircase. hypothesis: a young man is excited about his results and jumping around.
neutral: There is no way to know why the young man is jumping through the air, he could be showing off, he could be simply bored and making his staircase travel a little more fun. There is no way to tell he is excited about his results simply by observing a young man jumping through the air near a staircase.