And still none.
So thinking specifically about this one incident, since apparently no other victims of crimes matter to you, it's possible more than one person knows who the attacker is, but only one has so far come forward. If multiple people know, but anyone who's so far spoken gets charged, that's a big fat incentive for the other/s to stay quiet. And who knows, that evidence could be the difference between a conviction or not in this case. The pusher walking free because of this bright idea.
It's one of those things that sounds all righteous and shit until you think about how we need to run a system that actually encourages witnesses to come forward.