John Paul Riley, 21, sped up on his dirt bike to confront Dylan Brown in Glasgow’s Royston on February 1, 2024.
Riley had previously tried to get the cash back from the 20-year-old.
The victim – who had hearing issues – had been walking to a shop with a 13-year-old boy at the time.
Riley appeared from behind on his bike with his hood up and his face partially covered by a snood.
The laughing thug stated to him: “I told you I would see you, Dylan.”
Prosecutor Anna Chisholm told the High Court in Glasgow that Riley then pulled the victim to the ground and repeatedly struck him with a knife.
Dylan managed to stagger to his feet before Riley escaped on his dirt bike.
A bloodstained Dylan asked the boy to get him help.
The victim’s mum then drove him to hospital. Dylan stated: “I cannot breathe. He stabbed twice in the back and once in the chest.”
Dylan required extensive emergency treatment – the injuries included a collapsed lung.
The court heard he had been at serious risk of “catastrophic” bleeding.
Dylan – who also had an injury to his bowel – remained in hospital for almost a week.
He has been left scarred for life.
Riley, of Royston, could not be traced at the time, but later handed himself into police.
He was sentenced today having earlier pleaded guilty to attempted murder.
Lord Matthews told Riley: “According to a victim impact statement, as a result of the operation, he had over 70 staples on his body, which left him with a very bad scar from chest to groin.
“He was in pain for months, and his confidence has been severely compromised.
“He feels constant embarrassment and shame as well as suffering difficulties with his mental health, panic attacks, flashbacks and has delusions of being attacked again.”
Riley was also ordered to be supervised for a further two years on his release.
