 There's no place in America for this kind of violence. It's sick. It's sick. It's one of the reasons why we have to unite this country. We cannot allow for this to be happening. We cannot be like this. We cannot condone this. Greg Smith was attending the rally and tells BBC News. We're like, hey, man, there's a guy on the roof with a rifle. And the police were like, huh, what? They didn't know what was going on. We're like, hey, right here on the roof. We can see him from right here. We see him.