Pedestrians like that, I would not brake hard for if I had traffic following me close behind; too dangerous for me, too dangerous for those behind me. No, I'll brake gently, send them flying, come to a careful stop that doesn't fuck up everyone else behind me, and then call for an ambulance and the cops. Then, if the pedestrian is still alive, I'll gently whisper in their ear, "You're a fucking moron, you know that? I hope you survive to remember that."
I wouldnt damage my car hitting him. But I would bust his head open, THEN call the police