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

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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. It was 7:20 p.m. on April 5 — twilight — and multiple witnesses had gotten a clean view of Carmignani’s attacker: a young homeless man who was a familiar presence in the neighborhood. The police arrested him two minutes later, right down the block. An ambulance took Carmignani to Zuckerberg San Francisco General Hospital.