Q: "a couple of people struggling through a muddy pit" Does this mean that "They are at the annual Mudders competition"?
A: it is not possible to tell

Q: "A man in a military uniform is playing the drums in a marching band." Does this mean that "an rotc member plays the drums during a halftime show"?
A: it is not possible to tell

Q: "A man wearing a Canadian flag at a celebration." Does this mean that "A man is wearing an American flag."?
A: no

Q: "A man in a blue shirt sits next to a dog on some stairs." Does this mean that "The man is actually a cat in disguise to confuse the dog."?
A:
no