The teen said that Amen then noticed his friend with the frying pan behind him, and he feared he was going to stab him.
Iain McSporran KC, defending the 17-year-old, asked if he had told Amen to leave his own client alone because he had “nothing to do with this”.
He replied: “Yes.”
The boy said Amen then turned back around, at which point he stabbed him with the sword.
The accused said he was “panicking and scared” as Amen ran away, bleeding heavily.
He told the court he was not aware that Amen then collapsed on Clarendon Street.
He said he removed his blood-stained jogging bottoms and threw them over a wall.
He also later visited the city’s Kelvingrove Park where he kicked the alleged murder weapon near a river.
The trial was previously told that the accused had carried out an internet search of Amen and the incident on the day following the events.
He said: “I knew he was badly injured. I had no idea that he died.”