Mr Wilson said Zabell then told the woman he was going to kill her and her son.
The woman climbed onto the back seat to get away from Zabell who continued to attack her by unleashing a series of swinging punches.
Zabell struck the young boy and continued driving to a house in High St, Masterton.
He drove up the driveway, got out and proceeded to drag the woman from the car and inside by her hair.
He told her to take off her clothes and her son's clothes as they were covered in blood.
Soon afterwards Zabell took the boy into the bathroom and his now-estranged partner managed to escape, fleeing to an hotel.
On reaching the hotel she asked for help before returning to the house.
Zabell confronted the woman while his mother, who had arrived at the home, stood between them and tried to calm the situation.
Zabell then hit his mother with a back-handed blow to her jaw.
She left the house taking the woman and boy with her.
Zabell found the woman's mobile phone and snapped it in half. He also opened the woman's digital camera and took out the battery.
Police located Zabell's car in Carterton, finding an aluminium baseball bat in the front passenger footwell.
When spoken to Zabell told police his partner had endangered their lives by pulling on the handbrake and putting a towel over his face while he was driving.
He said he kept a baseball bat in his car to protect himself.
Judge Pat Grace said that the level of violence shown by Zabell almost certainly ruled out a community based sentence.
"In my view, with that level of violence, the chance of you being released with a community based sentence is slim," the judge said.
Zabell's solicitor James Elliot said alcohol was a factor in the case.
Judge Grace remanded Zabell in custody until April 11 and ordered an alcohol and drug assessment be carried out.