The law would have made it illegal to film police officers within 8 feet of law enforcement activity if the officer had requested the citizen or journalist to stop filming. In addition, officers could have ordered anyone filming on public property to stop if they determined the area was unsafe or if the person filming was interfering.
It becomes an issue because the cops can simply say they were within 8 feet or approach the person filming and then make them stop. It would be instantly abused to stop evidence of discrimination or anything else. Striking this down was the right choice