"Your version is so improbable that nobody would ever think it's reasonably, possibly true it's so impossible," Prosecutor Gerrie Nel thundered during his second day interrogating the Olympian.
Nel also rubbished the athlete's claim that police moved important pieces of evidence after arriving at the scene early on Valentine's Day morning last year.
Under intense questioning, Pistorius said police moved fans, put the duvet on the floor and opened the curtains when they came to his villa, implying they had tampered with the crime scene.
Pistorius, known as the "Blade Runner" for his j-shaped prosthetic legs, has been charged with murdering his 29-year-old model girlfriend after shooting her four times through a locked toilet door.
He faces a life sentence if convicted.
The double-amputee, once revered for his triumph over disability, has said he fired the shots accidentally and did not mean to kill anyone.
He also testified that he feared someone was coming through the toilet door and that his life was in danger.
This seemingly contradictory account was probed at length by Nel, who drew a concession from Pistorius that the shots should not have been fired at all.
"We know for a fact that you had no reason to shoot, objectively speaking."
Pistorius responded: "That's correct my lady."
Pistorius's cross-examination is a key point in his trial and a stern test of both his version of events and of his resolve.
Regardless of who Pistorius thought was behind the door, he could face a stiff sentence if Judge Thokozile Masipa rules he purposely used lethal force without reasonable cause.
Nel spent most of the first part of his cross-examination accusing Pistorius of being a selfish, controlling boyfriend who cared more about himself than the death of his girlfriend.
"She's scared of the feelings that she has for me and the way that I brushed her off," the athlete said by way of explanation. "It's all about 'I'. It's all about Mr Pistorius," Nel said.
When Nel asked what Steenkamp meant by saying Pistorius picked on her "incessantly," the runner got defensive.
"There are people who will testify I didn't pick on her in any way," he said. Nel also used questions about three separate gun charges to try and show that Pistorius, who has been described as a "gun enthusiast," was irresponsible.
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