A cut to a woman's eye that the Crown says was caused by a knife was really caused by a child's toy tractor, according to the Mongrel Mob member accused of inflicting the wound.

Sio Muliipu, who is defending seven charges of assault, kidnap and causing grievous bodily harm to his partner, admitted causing the injury when the pair had an argument on December 5 last year, but he denied using a knife as claimed by the woman, whose name is suppressed.

Giving evidence in the High Court at Napier yesterday, Muliipu, 24, said he threw several toys at the woman and noticed she was in pain only after he threw the second to last one. He told the court he could not remember exactly what he threw, but remembered there were teddy bears and tractors.

The wound caused the woman to go instantly blind in her left eye, which bled profusely, and ultimately had to be removed.

Ophthalmologist Philip Macdonald had told the court earlier that the wound was "almost surgical in nature", about four centimetres deep and probably caused by a small knife. The chances of it being caused by something thrown were "astronomically low".

Muliipu, who has gang tattoos across his face, forehead, neck and arms, denied assaulting the woman on two occasions in late November but admitted kicking and punching her shortly before the eye injury. He said she had lied about the assaults.

Crown prosecutor Jo Rielly asked Muliipu to look at an exhibit photo of the woman's eye injury and asked how likely it was to have been caused "by a toy tractor of a child aged about 3 ".

"I was just picking stuff out of the box and chucking it at her," Muliipu said.

The Crown alleges he kidnapped the woman from a house in Hastings before the assault at his brother's house. He denied dragging her from the house by her hair, despite conflicting evidence from the woman and other witnesses.

The Crown says he held her against her will, threatened to kill her and told her she would never see their 3-month-old twins again. He denies all of that.

His lawyer, Eric Forster, closed by saying there were doubts about the woman's evidence, much of which he said was inconsistent.

Muliipu's brother, Time Muliipu, is on trial for being a party to kidnap. His lawyer, Roger Philip, closed by saying his client had been "a passive presence" in the alleged kidnap and had discouraged his brother from taking the woman.

Justice David Collins will sum up this morning.

- © Fairfax NZ News