Q: "A man wearing all black jumps through a man-made waterfall." Does this mean that "John notices the waterfall and decides to take a plunge."?
A: it is not possible to tell

Q: "A guy typing on a laptop computer." Does this mean that "A man works on mTurk on his iPad"?
A: no

Q: "Skater does a trick on a rail." Does this mean that "The skater is on the rail."?
A: yes

Q: "A mechanic with paint stained overalls works on a fancy car's tire and a photographer in a yellow jacket takes a picture." Does this mean that "The car is full of rust."?
A:
no