A teenager was among a group of five who launched a vicious attack on a man in broad daylight last year that led to the victim's right foot being partially amputated.
Photos taken by onlookers of Mr Dhines Selvarajah, 27, lying injured on the road in Little India on July 25 were posted on social media.
A district court heard that Mr Dhines cannot walk properly now.
Yesterday, one of his attackers, Sharvin Raj Suraj, 18, pleaded guilty to one count each of rioting with a deadly weapon, being part of an unlawful assembly and having a knife in his possession.
Sharvin is the first member of the group to be convicted for taking part in the attack.
The cases against Haresh Shanmuganathan, 23, Arjun Retnavelu, 24, Victor Alexander Arumugam, 25, and Dinesh Kumar Ruvy, 28, are pending.
At around 2.15pm on the day of the attack, Mr Dhines was sitting at a bus stop in Serangoon Road when he was spotted by the five Singaporean men, who were in a car.
Deputy Public Prosecutor Pavithra Ramkumar told the court that the men had "previous disputes" with Mr Dhines and wanted to attack him. Court documents did not disclose details of the disputes.
Dinesh, who was the driver, stopped the car by the side of the road. After the five men got out of the car, three of them retrieved some weapons from a box that Arjun had placed in the boot.
Arjun picked a chopper, Dinesh chose a samurai sword and Sharvin took a baton, the DPP said.
"Haresh confirmed the identity of the victim and signalled to the accused and co-accused persons to attack," DPP Pavithra told District Judge May Mesenas.
"Arjun ran forward to the victim and started to slash him with the chopper. Dinesh then unsheathed the samurai sword and started slashing the victim with it. The accused then hit the victim with the baton and Haresh joined in by throwing punches and kicks at the victim," she said.
The men left in the car after the attack. An ambulance took Mr Dhines to Tan Tock Seng Hospital where he was found to have suffered injuries including a partial amputation of his right foot and a wound at the back of his head.
He was hospitalised for a week and given three months of hospitalisation leave. The Straits Times previously reported that the police nabbed the five within 16 hours of the attack.
Separately, Sharvin admitted in court yesterday that he had a knife in his possession on June 3 last year. He was also part of an unlawful assembly while out on bail in January this year.
Judge Mesenas has called for reports to assess Sharvin's suitability for reformative training and probation. The teenager is expected to be sentenced on July 5.
Offenders convicted of rioting with a deadly weapon can be jailed for up to 10 years and caned.