Q: "A man sitting on his backpack on the sidewalk." Does this mean that "A dog and a pig play in some mud."?
A: no

Q: "A smiling young girl swimming in a lake or river that has murky water." Does this mean that "A child is smiling to a friend when swimming in a lake."?
A: it is not possible to tell

Q: "A girl falling off a yellow and blue water tube." Does this mean that "A girl is falling."?
A: yes

Q: "A woman is shoeing a horse." Does this mean that "The woman is with a horse."?
A:
yes