Q: "A young male holding on to a large rock." Does this mean that "A boy is holding the rock."?
A: yes

Q: "A woman walks on a city street." Does this mean that "A shopper walks past a row of department stores."?
A: it is not possible to tell

Q: "A band is playing guitars and singing into microphones." Does this mean that "Some musicians are making music."?
A: yes

Q: "A boy and a woman in Arab costume making peace signs." Does this mean that "A man and his brother are dressed in Arab costumes."?
A:
no