A boy told police interviewers that he ran away when he realised his friend was raping a 14-year-old schoolgirl, a trial in Dublin has heard.
Two youths, aged 13 at the time and who cannot be identified, have pleaded not guilty to the murder of Ana Kriegel in Lucan last May. Boy A has also denied aggravated sexual assault.
Boy B yesterday told the Central Criminal Court he saw Ana and Boy A "struggling" before she was "flipped" onto the ground. He said Boy A then climbed on top of Ana, started choking her and "slowly" taking off her clothes.
Boy B told gardai he realised that Boy A was "raping" Ana and he "had to run". He said Boy A had a "blank face" and was showing no emotion while Ana was crying and begging him to stop.
Yesterday the jury continued to watch video footage of interviews which gardai conducted with Boy B after he was arrested for a second time on suspicion of the murder.
The interviews took place at Lucan Garda Station on July 7, 2018.
Boy B said he walked into the abandoned house where Ana's body was later found, looked around, picked up a stick or white plank and then put it down. He walked back outside and Ana and Boy A walked into the house. He said Boy A then told him to leave.
Boy B said he stood by the doorway and watched as Boy A "took her down and stripped her". Boy B said he then ran out of the house.
Asked to describe exactly what he saw, Boy B said he saw Boy A on top of Ana, taking her clothes off.
Boy B said he was standing there, staring, wondering what he should do. He could see Boy A choking Ana.
He said they were both on the ground "struggling".
Boy B said his brain realised what was happening. Boy A then turned his face and he had "this look on his face". Boy B said he couldn't describe the look.
During the seventh interview, Gda Daly asked Boy B to give him a guided tour of what he had seen.
Boy B said he went into another room but he heard "shuffling" from the room Boy A and Ana had gone into.
He said he went over to see what was happening. He stood at the door and saw Ana and Boy A. At first it looked like they were hugging. He couldn't see their faces. Both were struggling and then Boy A flipped her onto the ground.
Boy B said Boy A climbed on top of Ana and started choking her with his right hand. He slowly took off her jumper, T-shirt and pants.
He said he then realised Boy A was raping Ana and he "had to run".
Just as Boy A was about to take off Ana's bra, Boy B said Boy A looked up and that's when he (Boy B) ran.
Asked if he took off any of Ana's clothes, Boy B said: "No."
Asked if he went into the room, Boy B said: "I didn't."
The trial continues.