Q: "Four casually dressed guys jumping down a stairway outdoors with a stone wall behind them." Does this mean that "four guys jumping down a stairway"?
A: yes

Q: "A large number of people walk or rest near a fountain." Does this mean that "People walk or rest near a fountain."?
A: yes

Q: "A church assembly is listening to a choir perform." Does this mean that "a choir is singing"?
A: yes

Q: "A man is wearing black and white while looking at what a woman in gray and white is holding." Does this mean that "The man is a student."?
A:
it is not possible to tell