Before onlookers in a park , a man in a black shirt and rollerblades slides backward down a railing .
It is probable that a man is showing off for a girl by rollerblading .
It is unlikely that a man is showing off for a girl by rollerblading .
It is probable that a man is showing off for a girl by rollerblading .
A man is showing off for a girl by rollerblading .