Q: "A man in a green vest is standing in front of water." Does this mean that "A man with brown pants and a green vest is standing by his bathtub."?
A: it is not possible to tell

Q: "A man is playing baseball." Does this mean that "The man is a professional baseball player."?
A: it is not possible to tell

Q: "A group of motorcyclists drive around a parking lot." Does this mean that "People are riding motorcycles."?
A: yes

Q: "A man in a yellow shirt is playing slide on an acoustic guitar on a stage with a microphone." Does this mean that "A man plays his guitar on stage."?
A:
yes