A former SAS soldier who says he watched Ben Roberts-Smith perform an "exhibition execution" has described his heartbreak over the effect alleged war crimes had on another comrade's life.
The witness codenamed Person 24 previously said he watched the war veteran open fire on an Afghan prisoner's back after throwing him to the ground during an April 2009 mission to a compound dubbed Whiskey 108 in Uruzgan province.
"It was an exhibition execution, he wanted people to see he was going to kill someone out there in front of everyone," he told the Federal Court on Tuesday.
