He agreed to tag along when his alleged accomplices decided to go on a robbing spree that evening.
But former cleaner Hairee Landak, 23, told the court on Wednesday that he was shocked when one of them, Micheal Garing, whipped out a parang and slashed their first victim, Mr Sandeep Singh.
The 27-year-old Mr Singh, a cleaner, suffered multiple slash wounds and an open skull fracture, but survived the attack. Another victim, Indian national Shanmuganathan Dillidurai, 41, was not so lucky in the May 2010 attacks.
Hairee was testifying against his fellow Sarawakians - Micheal, 25, and Tony Imba, 34 - who are on trial for the murder of Mr Shanmuganathan.
They are also accused of robbing and hurting three other men shortly before the murder.
Hairee was sentenced to 33 years' jail and 24 strokes of the cane in January after pleading guilty to three counts of armed robbery with hurt.
Testifying in Malay on Wednesday, the sixth day of the trial, he said: "After the attack, Tony and I asked Micheal why he used the parang, but he didn't say anything."
Hairee, who is from the Iban ethnic group, said he had known Micheal for five years as they lived in the same village.
He also knew another alleged accomplice, Donny Meluda, for about five to six months before the attacks, but met Tony for the first time that evening.
Donny is still at large. Hairee said they had been drinking alcohol at a friend's home at Lorong 12, Geylang, when Micheal and Tony came up with the idea to rob.