An innocent painter and decorator died after being stabbed 25 times as he got caught up in gang warfare on a housing estate, the Old Bailey has heard.
Andrew Jaipaul, 21, was "savagely attacked" by a mob as he walked home through the Andover estate in Holloway, north London, in June 2011.
Prosecutor Zoe Johnson QC said he was in the wrong place at the wrong time.
Eight defendants, said to be from the Busy Block gang, deny murder, conspiracy and violent disorder.
Miss Johnson said Mr Jaipaul was the victim of a series of "escalating attacks" between rival gangs in north London.
"Andrew Jaipaul was minding his own business when, out of nowhere, a large, armed gang came across him, decided to attack him, chased him down and brutally murdered him near a children's play area," she said.
Jurors heard people had seen the attackers, whose gang was from the nearby Elthorne Estate, go after Mr Jaipaul and kill him.
"As the members of the group left, they were heard to shout 'Busy Block'," she added.
A 15-year-old boy and a 17 year-old-youth, who cannot be identified for legal reasons, and six other defendants deny murder, conspiracy and violent disorder.
The other defendants are Tommy McInerny, 20, of Islington, north London; Jojo Mafwa, 19, of Tottenham, north London; Alan Kalema, 19, from Wychdell, Stevenage, Hertfordshire; Tirrell Ball-Thomas, 18, of Finsbury Park, north London; Warren Brooks, 23, of Islington; and Orville Sterling, 18 of Enfield, north London.
The trial continues.