The Wall Street subway station is near the World Trade Center, so it is reasonable to assume that the crowd of police officers is rushing out of the station in order to respond to calls about the tightrope walker. Although Fernando is initially held back by his obligation to go to work, he finally decides to follow his artistic impulse by tailing the cops, camera in hand. Just like the tightrope walker and the graffiti artists he so admires, he no longer needs permission to do his art.