Q: "One man in an orange shirt wearing a white helmet is riding a bike." Does this mean that "A courier rides his bike through the city."?
A: it is not possible to tell

Q: "Man in red bandanna straining to lift a heavy barbell." Does this mean that "The man is using his muscles."?
A: yes

Q: "two old guys talking to each other" Does this mean that "The guys are talking"?
A: yes

Q: "A young man wears a helmet and protective clothing as he races his dirt bike through a muddy track." Does this mean that "the man is a worker"?
A:
it is not possible to tell