A prosecutor repeatedly asked Oscar Pistorius today why his girlfriend Reeva Steenkamp failed to scream when he shot her four times through a toilet door.
In the third day of his cross-examination at the Pretoria High Court, Gerrie Nel, one of South Africa's top attorneys, said it was beyond belief that Ms Steenkamp would have remained silent in the tiny cubicle with an armed Mr Pistorius shouting and screaming in the adjoining bathroom.
Mr Pistorius, who says he fired at what he thought was an intruder, said Ms Steenkamp did not scream at any point in the incident in the early hours of 14 February 2013 - a central pillar of his defence.
However, under questioning, the 27-year-old track star was forced to concede that he may not have heard her cries because of his ears ringing from the first shot.
Several people living nearby have testified to hearing a woman's terrified screams before and during a volley of shots.
"She's awake. She's in the toilet. You're shouting. You're screaming. You're three metres from her. She would have responded. She would not have been quiet, Mr Pistorius," Mr Nel said.
"She didn't respond, my Lady," Mr Pistorius replied, addressing judge Thokozile Masipa.
"Did she scream at all whilst you shot her four times?" Mr Nel continued.
"No, my Lady."
"Are you sure? Are you sure, Mr Pistorius, that Reeva did not scream after the first shot?" Mr Nel continued. "Are you, Mr Pistorius?"
After a brief silence to collect himself, Mr Pistorius said: "My Lady, I wish she had let me know she was there."
"After you fired the first shot, did she scream?" Mr Nel asked.
"No, my Lady."
"Are you sure? Would you have heard her?" Mr Nel asked.
"I don't think I would have heard her."
"A gunshot went off, my ears were ringing," Mr Pistorius said.
"How can you exclude the fact she was screaming if you couldn't hear?" Mr Nel asked.
"If I couldn't hear it then I couldn't hear," Mr Pistorius retorted.
"No, you said, Mr Pistorius, she never screamed. You couldn't hear. You're just saying that," Mr Nel said.
"That is what I'm saying," Mr Pistorius replied.
"No, that's not what you're saying. You're saying she didn't scream," Mr Nel followed up.
"My Lady, the sound of that gunshot in the bathroom, you wouldn't have heard anyone scream. The decibels of the gunshot, I don't believe you would have heard anyone scream. When I had finished firing the gunshots, I was screaming and I couldn't hear my own voice."
Mr Nel later followed up with his central accusation - that the couple had an argument and Ms Steenkamp, a 29-year-old law graduate and model, fled to the toilet pursued by Mr Pistorius, who then shot her through the closed wooden door.
"You knew that Reeva went behind the door and you shot at her," Mr Nel said. "You shot at her knowing she was behind the door."
Mr Pistorius denied it. The court then adjourned until Monday morning.
Mr Pistorius faces life in prison if convicted of murder.