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It is unclear whether Davion Powell, 18, ever landed one of the punches that got him killed.

In the 90-second cellphone recording, Davion tugs another young man down a stoop, fists flailing like a teenage boy on the brink . His target, a man the police said was a member of the Bloods street gang, had insulted one of Davion’s best friends, Clevens Valcin, who had been killed in Flatbush days before.

The tangle was over in seconds, and the only thing wounded was pride. But that was enough. At 5 p.m. the next day, detectives said, Bloods gang members lured Davion to the same stoop and fired almost a dozen shots into his stomach. He was dead in minutes.