An altercation in San Francisco has raised fears about the city’s future — but also questions about what really happened. : An altercation in San Francisco has raised fears about the city’s future — but also questions about what really happened. Don Carmignani, a longtime resident of the Marina neighborhood of San Francisco, who was involved in a violent altercation there in April.Credit...Preston Gannaway for The New York Times Responding to 911 calls about a street fight in the Marina district, the police found Don Carmignani, 53, standing on the sidewalk with blood streaming down his face.