A defenceless teenager was battered to death by a posse of men bent on revenge after he spat at a pensioner, a court heard.
Fuad Buraleh was viciously attacked and left to die in Dean Gardens, West Ealing in the early hours of January 26.
The Old Bailey heard on Tuesday how a gang mercilessly targeted the 19-year-old within half an hour of an altercation on a 207 bus with 67-year-old Carl Cadogan.
Mr Cadogan's son Myles, 24, and his friends Scott Baker, 21, Lee Beavis, 26, Anthony Sheehan, 22, and Richard O'Donoghue, 23, were all allegedly members of a 'makeshift posse' who rushed to the scene in two cars.
Myles Cadogan admitted hitting the victim with a bottle, and prosecutor Aftab Jafferjee said Buraleh "did not stand a chance" when faced with overwhelming numbers.
Mr Buraleh and a cousin had been swigging vodka out of a plastic bottle on the bus and were on their way to meet friends in the park.
Mr Buraleh spat on the floor first and was challenged by Cadogan who said: "Who are you to spit on the floor."
As the 207 pulled up the two cousins got off the bus and Mr Buraleh spat on Cadogan's clothes.
Prosecutor Aftab Jafferjee said: "Albeit probably fuelled by drink it was nevertheless disgusting and obnoxious behaviour.
"The price that the 19-year-old had to pay for such behaviour was his life."
The two men squared up to him as they got off the bus and Cadogan aimed a kick at them through the doors.
As the bus pulled away Cadogan pulled out his mobile phone to call his son and was allegedly heard to say: "You need to get down here to West Ealing. We need to sort things out."
CCTV captured a VW Golf and a Peugeot travelling to Dean Gardens.
Faced with the menacing arrival of the gang, all Mr Buraleh's friends fled in terror, it was claimed.
The attackers then allegedly fled in their cars while Carl Cadogan got back on the bus.
Two days later three of the gang - Baker, Beavis and Sheehan - handed themselves in, blaming Myles Cadogan for the killing.
The next day both Carl and Myles Cadogan also went to police. Cadogan admitted hitting the victim with a bottle but claimed it was in self defence.
Carl Cadogan answered police questions but claimed he called his son because he was in distress and wanted a lift home.
Carl Cadogan, of Lambourne Close, Hanwell, O'Donohue, of Browning Avenue, Hanwell, Sheehan, of Acock Grove, Northolt, Myles Cadogan, of Brondesbury, and Beavis and Baker, of Ruislip, all deny murder and violent disorder.
The trial continues.