The old guy could have answered the questions. Five minutes of jawing would have convinced anyone that he wasn’t a fake.
He DID answer questions. He was followed and harassed even AFTER he answered questions. At a point it was no longer "asking questions" but an attack on him.
Also, I see an angry, hostile black man using his position of authority to threaten and intimidate an older and weaker white man.
Said policeman should be punished severely.