Two young women have told a jury about the last moments of their friend Laa Chol, who bled to death after being stabbed at a Melbourne party.
Dahlia Ali told a Supreme Court jury on Tuesday she went to Ms Chol's aid after seeing her "getting kicked and punched" by gatecrashers, who she suspected had taken her mobile phone.
Ms Ali recalled trying to get the group of youths away from Ms Chol, who was knifed in the chest by a 17-year-old boy during the violent scuffle.
"Someone opened her jacket and then I just saw blood," Ms Ali said.
Another friend, Nyankor Joseph, told the court she rushed to Ms Chol's side and searched for a wound "because I saw all the blood".
"There was a lot of blood around her. She looked unconscious. She was not responsive," Ms Joseph said.
"I raised her shirt to try to apply pressure to her wound. It was on the left side of her chest."
Forensic pathologist Matthew Lynch said the knife was wielded with "at least moderate" force, piercing the sac surrounding Ms Chol's heart and her right ventricle.
Ms Chol died in the early hours of July 21 last year, inside a city apartment she and her friends rented via Airbnb with plans for a weekend of fun.
After fighting with the gatecrashers inside the building's lift lobby, she stumbled back to the apartment and collapsed, dying before paramedics arrived.
Dr Lynch said Ms Chol died from blood loss, including bleeding inside the sac surrounding her heart, causing cardiac failure.
She also had a superficial wound on her right hand, which might have been a defence injury, he added.
Under cross-examination by defence barrister Sam Norton, Dr Lynch agreed that when Ms Chol was stabbed, others might have been unaware how seriously she was injured.
Paramedic Damien Dambrosi said he arrived at 5.18am to find Ms Chol unconscious on the floor, "quite soaked" in blood.
He pronounced Ms Chol deceased at 5.30am, finding no pulse and "a complete flatline" after attaching defibrillator pads.
The killer, who was 17 at the time so legally cannot be named, is on trial fighting a murder charge.
He is asking the jury to convict him instead of the lesser crime of manslaughter, and therefore receive a shorter jail term, arguing he did not intend to kill or seriously injure Ms Chol.
The trial is due to continue on Wednesday.