Ex-soldier Gareth Crook, the man whom the prosecution say probably saved Jessica Knight's life, found her "moaning and gurgling" on the ground as he cycled home from work.
"He could see blood spurting from the side of her neck," William Waldron QC, prosecuting, told the jury at Preston Crown Court.
Kristofer Beddar, 21, of Daisy Hill Drive, Adlington, Chorley, denies attempted murder. He accepts he inflicted the wounds but denies the intention to kill.
The court heard that Mr Crook "removed his hat and put it beneath Jessica's head and used his gloves to apply pressure to the neck wound in order to stem the flow."
Police and paramedics soon arrived and a police officer drove the ambulance to hospital as the two ambulance men desperately tried to keep Jessica alive in the back of the vehicle.
Mr Waldron said: "Kristofer Beddar left Jessica Knight lying face down, alone in the dark, bleeding to death from his savage attack on her. He literally left her for dead. Had it not been for the timely appearance of Gareth Crook, we submit she would have died."
Mr Crook told the court he was cycling through the park when he saw Jessica, 14, lying in a pool of blood.
"Blood was spurting from her neck. I applied pressure to the neck using my glove," he said.
The girl was unconscious and Mr Crook noticed an iPod on the ground near her.
Jessica's mother, Jill Walmsley, said in a statement read to the jury that her daughter attended Parklands secondary school in Chorley.
That night she returned home from school, got changed and went to visit friends.
When she did not return at her usual time, she contacted police.
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