Ismail had just finished daily prayers when the men approached. It was a sweltering evening in the Maadi district of Cairo, and the group of three bearded figures, who had been loitering outside a mosque, spotted him as soon as he walked out. Ismail, a struggling Sudanese migrant, hadn’t eaten in a few days, leaving his eyes badly bloodshot. The men took notice of his condition. As they advanced, the air thick and choked with pollution, a cloud of dust swirled around them, settling on their clothes and facial hair.