It took a jury just three hours to find Miroslav Jovanovic, 55, guilty of using a small knife to stab the man six times in the back in an alleged revenge attack.

The knife passed through gaps in the victim's ribs, causing a collapsed lung, a severed artery and severe blood loss.

Blood was seen by bystanders seeping through his shirt as he waited for an ambulance, and the man gave evidence that he thought he was going to ''bleed out'' and die.

Jovanovic did not react on Friday afternoon as the jury delivered its verdict in the ACT Supreme Court, where he had stood trial this week before Justice Richard Refshauge.

He had known the victim before their encounter at the interchange, and there was some bad blood between them.

The Crown said Jovanovic was out for revenge after the victim assaulted his son while both were incarcerated in the same prison cottage.

Jovanovic, the Crown said, saw the man as he went to get his bus in April last year.

He ran up behind him and delivered a single ''sucker punch'' to the back of his head.

Prosecutors said the man got up as Jovanovic was still recovering from the punch, and the pair then wrestled.

The Crown claimed Jovanovic overpowered the man, got him in a headlock, and then intentionally stabbed him repeatedly in the back with the knife. But Jovanovic, represented by barrister James Lawton, had maintained his innocence to the charge of intentionally inflicting grievous bodily harm, saying he was acting in self-defence.

He said the other man had threatened him before the attack, telling him he was going to ''cut his head off'' or something similar.

Jovanovic, an experienced boxer, claimed he was scared, because the man had just got out of prison and had already beaten up his son, who was much bigger.

He said he punched the complainant in the back of the head because he thought the victim would follow through on his threat, but allowed him to get back up for a fair fight.

The pair scuffled and Jovanovic said he saw the man produce a knife.

He claimed to have wrestled the knife from the man's grasp, but said he did not remember stabbing him.

Jovanovic admitted it was possible he stabbed the man, but said he was acting in self-defence.

Mr Lawton, in his closing submission, had asked the jury what they would have done in the same situation.

''You're going to do what you can to make sure you walk away from that fight,'' Mr Lawton said.

The jury began their deliberations about 11.40 on Friday morning following the summing up of Justice Refshauge.

Jovanovic did not apply for bail after the verdict.

His criminal history was tendered to the court.

Sentencing proceedings will begin next month.