Fresco said he had warned Pistorius that the gun was "one-up," meaning it had a bullet in the chamber.
"I knew that he had a big love for weapons," Fresco testified. "My assumption was that he had competency."
Roux asked Fresco when exactly he had warned Pistorius that there was a magazine in the gun and a bullet in the chamber, and when Pistorius had asked him to take the rap. The friend couldn't pinpoint the precise times.
"Will you agree, Mr. Fresco, you have uncertainty ... about what specifically happened and what was said?" Roux asked.
Roux sought to undermine Fresco's character, questioning why he crumpled up a speeding ticket and threw it on the floor of the car after he and Pistorius were stopped by the police. Fresco also said he'd been following some previous testimony in the case on Twitter, which witnesses should not do.
If convicted on the murder charge, Pistorius could be sent to prison for at least 25 years before the chance of parole, the minimum time someone must serve if given a life sentence in South Africa. The judge will ultimately deliver the verdict and decide on any sentence. South Africa has no trial by jury.
Pistorius was born without fibula bones because of a congenital defect, and his legs were amputated when he was 11 months old. He ran on carbon-fiber blades and is a multiple Paralympic medalist. He also competed at the London Olympics but didn't win a medal.
Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.