A young man standing on one foot in colorful bowling shoes after throwing the ball.
A person in a black shirt is standing on one foot.
Just because a young person is standing on one foot it does not mean they are in a black shirt.  A person does not have to be a young man.
There is no indication that the person is wearing a black shirt.
We do not know that the person is wearing a black shirt. We know only that he is wearing colorful bowling shoes.