He was charged last year with assault with a weapon, a Taser, and of illegally presenting a restricted weapon.
Prosecutor Bruce Northwood described the Crown's version of what happened inside that carpark.
He said after pursuing police stopped the vehicle the male driver of the car "bolted from the scene, leaving behind the young woman".
The young woman was Mary Jane Takerei.
Doak and his partner, Constable Florence Roberts, who had only been in the job a couple of weeks, were the first on the scene, the court heard.
However, Doak quickly "took off, possibly looking for the driver", Northwood said.
Roberts, who was hit in the face with some pepper spray from Takerei, and other police officers who had arrived at the scene apprehended Takerei - dragging her by her feet from the car, Northwood said.
"This was all captured on high-quality CCTV," he said. "The woman was lying face down on the ground, one officer either side."
Northwood said, "fairly early on and without too much difficulty" Takerei was restrained and "ceased to be any kind of threat to the police officers present".
Doak then returned to the scene, the court heard.
He knelt down beside Takerei with his Taser drawn before threatening to use the restricted weapon near her head as he attempted to extract information from her, Northwood alleged as he described the basis for the assault charge.
The young officer was demanding to know where the fleeing driver had gone but did not fire the Taser, Northwood said.
"Not surprisingly, the young woman didn't know where the young man had gone. She, however, was petrified.
"All she could do was hand over a name."
CCTV footage of the incident, played to the jury this afternoon, shows Takerei's legs flailing as she lies on the ground while Doak kneels near her head.
Roberts told the court, however, she didn't hear Doak threatening Takerei with his Taser or see him pressing it against her forehead and between her eyes as she claims.
The wanted driver, the court heard, was later found by police coming out of one of the elevators in the casino as he attempted to slip away.
Doak and his partner, meanwhile, were tasked with transporting Takerei home.
But Northwood alleged, "once again [Doak] drew his Taser in the [patrol] car" and presented it at Takerei.
When the constable did this he fired using the arc option, which triggers the Taser to produce an electrical current between two prongs, Northwood said.
Takerei was not shocked by the Taser.
A recording from the weapon will show it was used in the arc mode, the prosecutor added.
"He let his professionalism slip badly that night," Northwood said. "[Takerei] was no threat to him, to others or even to herself. [Doak] used his Taser in two clearly unacceptable ways."
But Doak's counsel, Todd Simmonds, told the jury his client was simply "a young cop doing what cops are meant to do".
He contested Takerei and the Crown's version of events and said the young woman had been "vigorously resisting arrest on the ground".
"[Doak] kneels down and is demanding to know where is the male and where has he gone, who is he?
"Doing what police officers are expected to do," Simmonds said.
He added while the Taser was drawn and in Doak's hands there was "no threat".
Referring to the incident later in the patrol car, Simmonds said Doak accepts he pulled the trigger "for about a second".
But Simmonds argued there is no evidence to suggest Doak presented the Taser at Takerei in the back of the police car.
"It was a breach of police policy and he accepts that. And he will have to deal with that internally, that's not why you're here," Simmonds told the jury.
"He will have to answer to his bosses. You're not here to be caught up in police policy and what is a breach of that."
Northwood said the jury would hear evidence about the availability of Tasers for police officers, and how the deployment of the electric shock weapon is guided by written policy.
"To put it simply, the use of a Taser is not a free-for-all," he said.
Superintendent Karyn Malthus, the Auckland City District commander, earlier told the Herald an internal police employment investigation will also be conducted pending the outcome of the court proceedings.
The Independent Police Conduct Authority is also carrying out its own investigation.
The trial, meanwhile, continues and is scheduled to conclude later this week.
