Q: "A man talking on the phone and walking by a large poster." Does this mean that "Someone is talking to their friend"?
A: it is not possible to tell

Q: "A man who looks like a cowboy is riding a bucking horse or bronco in a purple shirt and chaps." Does this mean that "The horse is brown"?
A: it is not possible to tell

Q: "A man attempts to fix a bike wheel on the side of a street near several motorbikes." Does this mean that "a man fixes the wheel on a bike"?
A: yes

Q: "Two men are setting up some electronic equpitment" Does this mean that "Two men are on their lunchbreak eating a sandwhich"?
A:
no