A teenager and man are facing years in prison following a Halloween night of violence which left one person dead and two others seriously injured.
Scotty Kouebitra, 22, had been setting off fireworks with friends in a Croydon park last year when he was chased by a group of men in balaclavas and hoods wielding knives, bats and a screwdriver.
Dramatic CCTV footage showed the part-time student as he was fatally stabbed in the neck, chest and arm with a large knife on October 31, 2016.
Friends Keith Hawker and Adil Jamal Abdilahi were also attacked, with the latter needing 50 stitches to his stomach.
Jahliel Rose, 21, and a 17-year-old boy now face life sentences after being found guilty of murder and wounding with intent at the Old Bailey.
The motive behind the attack remains unclear, but jurors were told the victims were simply in the "wrong place at the wrong time".
The court heard the group were captured on CCTV arriving at the park in two cars.
Mr Hawker told jurors one of the attackers had shouted "Let's shank (stab) him" and Mr Kouebitra had pleaded for someone to "call the Jakes (police)".
Mr Kouebitra, from Sutton, south London, collapsed face down in a yard in front of Mr Hawker after being fatally stabbed.
Mr Abdilahi described seeing his football friend being kicked and punched on the ground and hit with a metal pole.
Jurors took seven hours to convict the defendants.
Aaron Jackson, 26, of South Norwood, and Marcus Asemota, 23, of Bromley, were cleared of all charges.
The defendants will be sentenced on Wednesday.