A Victorian man who killed an associate after an argument about Nazi handguns says he was acting in self defence.
Jarrod Leonard Frank is charged with the murder of Scott Bury at the victim's Bendigo home after an altercation in January 2018.
Frank's lawyer David Gibson told a jury in Victoria's Supreme Court on Tuesday Frank accepted he had inflicted the knife wound that caused Mr Bury's death.
"And you can be sure that Jarrod Frank regrets the death of Scott Bury as much as anyone. But that doesn't make it a crime," he said.
"This is a case of self-defence, a classic case of self-defence, I might say."
Prosecutor Grant Hayward said the men, who had met just once before, bumped into each other in a shop in the regional city and began talking about the calibre of ammunition used in Luger handguns by German officers in World War II.
The court heard Mr Bury bet Frank $100 he was right because two years prior he had robbed a bank with a 9mm Luger.
The men returned to Mr Bury's home with another man, Anthony Lentjes, to research an answer.
Mr Hayward said Mr Lentjes would give evidence in the trial that after Googling the answer Frank turned to Bury and said "Hey bitch, here you go".
Lentjes would say Bury went to a kitchen drawer and pulled out two knives before telling Frank "you called the wrong bloke 'bitch' in the wrong house".
Mr Hayward said after Mr Bury struck Frank in the chest with one of the knives, causing a small cut. A scuffled continued outside, with Frank admitting to police afterwards they had grappled.
Frank admitted knowing Mr Bury had been injured.
"I felt that there wasn't much blood but I knew he'd been hit. I was thinking about his being in hospital for a week, maybe two, tops," Mr Hayward said Frank told officers.
The jury heard Frank went home after the fight and after initially returning inside his house Mr Bury went to get help from a neighbour.
He was extensively bleeding and underwent emergency surgery but died in hospital.
Frank told police he didn't know until the next day Bury had died. An autopsy showed he had one fatal stab wound to the abdomen, as well as other stab wounds to his front, back and hands.
"You can't say that there's any mark, apart from that one turned out to be lethal and I can't even say where that went. I must have been the torso," Frank told police when interviewed.
"I've stood up out of the car to protect myself because he was gunna - he was gunna kill me".
The trial will continue on Wednesday.