A teenager laughed to his friends after knocking down and killing a man with his own car, a court has heard.
Mr Bostock died the day before his 67th birthday
The 15-year-old stole Kenneth Bostock's Volkswagen Golf as he got out to open the garage at his home near Netherton, Merseyside, on 23 November last year.
Mr Bostock, 66, died after he stood in front of the bonnet of the car in an attempt to try to stop it being stolen.
The boy, now 16, admits manslaughter but is on trial at Liverpool Crown Court accused of murder.
The jury heard that the boy, who cannot be named for legal reasons, was loitering with a group of youths in a field near Mr Bostock's home shortly before the incident.
Screech of tyres
One of them, a 17-year-old who cannot be named, told the jury that the defendant was smoking cannabis and said he was "stoned".
He told the court the teenager had seen Mr Bostock drive up to his garage and say: "That's my cue, I'm off."
Speaking via videolink, the witness said he heard a bang and a screech of tyres before seeing the Golf driving at speed towards them on the field.
He said: "He came about 10 or 15 feet away from us.
"He put the passenger window down and shouted 'Aah, I've run him over, aah!'"
He said: "I told him that he had seriously hurt him [Kenneth Bostock] and that he was in a bad way.
"He said 'I had to. It was either him get hurt or me get caught'."
The defendant denies smoking cannabis and laughing about the tragedy.
Mr Bostock, who had been a merchant seaman, oil rig worker and bus driver, was killed the day before his 67th birthday.
The court also heard a written statement from his wife, Devena, who described the moment she saw her husband on the road.
She said: "As soon as I saw him I knew he was seriously injured.
"I knew from looking at him he was dead.
"I just stayed with him and tried to keep talking to him."
The case continues.