Three young men and a young woman wearing sneakers are leaping in midair at the top of a flight of concrete stairs .
There is a better than even chance that a woman falls down the stairs after three young men push her .
It is impossible that a woman falls down the stairs after three young men push her .
There is a better than even chance that a woman falls down the stairs after three young men push her .
A woman falls down the stairs after three young men push her .