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(CNN) -- Oscar Pistorius was back on the stand for a second week Monday, facing more relentless cross-examination as the prosecution challenges his account of the killing of his girlfriend, Reeva Steenkamp.
Prosecutor Gerrie Nel has accused the athlete of hiding the truth about the death of Steenkamp, whom he shot last year through a closed toilet door in his luxury home in Pretoria, South Africa.
His questions last week again sought to undermine Pistorius' reliability and credibility and to portray the Olympic and Paralympic athlete as someone who was inventing his version of events and "tailoring" evidence to suit his story.
Nel, known in South African legal circles for his bulldog-like approach to questioning, has gone through minute detail regarding the early hours of Valentine's Day 2013, repeatedly challenging the double amputee over his actions in the moments leading up to Steenkamp's death.
On Monday he bluntly told Pistorius the runner was "tailoring" his evidence.
"I am going to point out to you how improbable your version is," Nel told Pistorius, who sat immobile, staring ahead at the judge as he answered questions.
The prosecution's argument is that Pistorius shot Steenkamp intentionally after a heated argument. Pistorius does not deny shooting her but insists that he mistook her for an intruder. Pistorius said he thought he heard the toilet door opening before he fired.
"I didn't intend to shoot. My firearm was pointed at the door because that's where I believed that somebody was," he said. "When I heard a noise, I didn't have to think, and I fired -- I fired my weapon. It was an accident."
Prosecutor: You wanted to shoot
On Monday, Nel took Pistorius detail by detail through what happened on the night -- where he moved, how he moved, what he saw -- aggressively questioning him about the moments before the shooting.
Speaking about the noise he said he thought had been caused by intruders, the athlete described how he started shouting.
Asked what he shouted, Pistorius broke down as he answered: "Get the f--- out of my house. Get the f--- out of my house."
Judge Thokozile Masipa adjourned the court for a moment while Pistorius gathered himself.
On Friday, Nel hammered Pistorius on whether he had known Steenkamp was in the toilet when he fired.
"You knew Reeva was behind the door, and you shot at her," Nel said more than once.
"That's not true," Pistorius replied in a low tone.
That dramatic moment was when Nel asked for the trial to be adjourned until Monday morning.
Pistorius earlier denied being "ready to shoot" as he made his way to the bathroom where he says he heard what he thought was an intruder. But he agreed that he had taken off the safety catch so he could fire if needed. "I didn't want to take anybody's life. I screamed for the intruders to get out of my home," he said.
"You wanted to shoot," contended Nel, who has sought to build a picture of Pistorius as an arrogant hothead who is reckless with guns.
Pistorius replied that there is a "massive difference" between being ready for something and wanting to do it.
Asked by the prosecutor why he approached the apparent threat rather than seeking to move out of harm's way, the athlete said it was his in his nature to respond that way.
"I wanted to put myself between the perceived danger and Reeva," he said. "I wish I did all these other things put to me."
Nel also argued that it was "not possible" that Steenkamp would not have responded when Pistorius screamed to her about what he thought was an intruder in the house, as he has said happened. Steenkamp was only three meters from Pistorius at the time, behind the toilet door, he said.
"She would've been terrified, but I don't think that would've led her to call out," Pistorius said, arguing that Steenkamp would have assumed the danger was getting closer.
"She wasn't scared of anything except you. She wasn't scared of an intruder. She was scared of you," replied Nel.
The prosecutor also pressed Pistorius over whether he heard a woman screaming during the shots he fired, as some witnesses have said they heard. Pistorius said he did not.
Pistorius has denied he acted selfishly toward Steenkamp.
In a bid to paint their relationship as rocky, Nel has ripped apart message exchanges between the couple.
Nel also sought to paint him as selfish and demanded to know why the athlete did not respond to his girlfriend's declaration of love. But Pistorius said he preferred to talk to his girlfriend over the phone rather than messaging. He acknowledged he never got a chance to tell her that he loved her.
"Because it was all about Mr. Pistorius," Nel said.
The trial has gripped South Africa, where Pistorius is considered a symbol of triumph over physical adversity. His disabled lower legs were amputated when he was a baby,
Only those in the courtroom can see Pistorius because he has chosen not to testify on camera. His testimony can be heard on an audio feed.
The trial is scheduled to continue until the middle of May.
Judge Masipa will decide the verdict in collaboration with two experts called assessors. South Africa does not have jury trials.
CNN's Laura Smith-Spark, Faith Karimi and Emily Smith contributed to this report.
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