Q: "a man standing next to an oddly designed bike" Does this mean that "A man is sitting on the couch."?
A: no

Q: "A man stands on stage with a fireworks going off beside of him." Does this mean that "The fireworks are bright and noisy."?
A: yes

Q: "Teens dressed as Native Americans sit in the park with their school bags on the ground." Does this mean that "A group of teenagers."?
A: yes

Q: "A white-haired and bearded man reclines on a park bench." Does this mean that "The man is taking a nap."?
A:
it is not possible to tell