Q: "Men in black hats are standing in a crowd of people." Does this mean that "There are many people around."?
A: yes

Q: "One biker doing a stunt while onlookers watch in the far corner." Does this mean that "One biker doing a stunt while two onlookers watch in the far corner"?
A: it is not possible to tell

Q: "A young man spray paints graffiti on a wall." Does this mean that "The grafitti artist is working on a commissioned piece for the city."?
A: it is not possible to tell

Q: "Boys in Africa are outside playing soccer and enjoying themselves." Does this mean that "The kids are running."?
A:
yes