The defence said Collings "was robbed of his good sense in an absolute moment of madness", in their closing address to the jury.
Defence counsel Donald Matthews told the jury that Collings still had to be held to account -- he had offered a plea to manslaughter -- but he had no murderous intent and was not guilty of murder.
He argued that Collings was not dealing rationally, and had no time to think of the consequences in the 3.4 seconds it took for the car to accelerate into Robin Friend as he moved in front of the car, crush him, and crash into a roadside power box and hedge.
The incident in a Parklands cul-de-sac on July 30, 2020, came after an exchange of words at the driver's window of the car, between Friend and Collings, who was sitting in the driver's seat.
Matthews said witnesses in the car said it was "fairly petty, a fairly minor beef, and certainly nothing you would want to kill someone over".
The Crown case suggested there was swearing and a threat by Friend that Collings should "be sure to watch your kids". Collings' daughter had died a few weeks before.
Matthews said the jury might consider that after the threat, Collings had acted instinctively, without thinking in an absolute moment of madness.
Crown prosecutor Deirdre Elsmore said that in the seconds when Collings ran into Friend, the passengers in the car were screaming for him to stop. They had time to appreciate the danger, but Collings had continued with his course of conduct which could have been stopped at any time.
"This was a focussed, steely, determined act," she said.
There had previously been bad blood between the men, aggravated by a dispute about a woman they both seemed to care about, she said.
The incident was captured on a house security camera and played at the trial several times. Elsmore had it played again during her closing address.
She told the jury: "It could have been stopped at any time, but it didn't stop because the defendant didn't want it to. He wanted to hurt Robin Friend. He wanted to cause injuries so severe they could kill him. He simply wasn't listening as the passengers in the car screamed at him to stop."
Justice Mander thanked the jury, and thanked the counsel for the conduct of their trial. He complimented counsel, Elsmore for the Crown and Matthews for the defence, on their closing addresses to the jury.