Bingo. Has the US Supreme Court offered some guidance on what a "safe distance" is? If not, they probably should. I've seen cops yelling threats at video-takers who are standing way down the street from some minor arrest.
In my opinion, any distance that the police are allowing people to stand is fair game. The more they react, the more they are very likely guilty of violating procedure, violating people’s rights, and committing crimes against citzenry. I do not care what the protest is, our constitutional rights as citizens outweigh the police preference to abuse and kill citizens in private.