He then pulled a cellphone charger from the wall, striking her around the face with it and then took her cellphone from her, preventing her from phoning police.
Wall pleaded guilty to male assaults female and breaching a protection order.
Lawyer Virginia Pearson said he was extremely remorseful and had done a lot of work since being remanded in custody.
"He wished it hadn't happened but accepts that it did. There is real hope for change. He wants to make change," she said.
Wall was supported in court by his partner. She is due to give birth in December.
He had recently moved from Taupo, breaking affiliations with a gang he was involved with, and he and his partner wanted the relationship to work, she said. "[Wall] definitely is at the point where he is ready to change. I know you hear that a lot but he has demonstrated by actions, he is ... he has moved from decades of gang affiliations, a positive step ... he's moved away from these negative influences. This is a real opportunity to change."
She asked the court to step back from a jail term and impose an electronically monitored sentence.
"He understands this is really an opportunity for him. He instructs he wants to grasp it. He is ready and willing to change," Ms Pearson said.
Both Wall and his partner had written to the judge asking for him to be given a chance.
However, Judge Becroft said he could not ignore Wall's previous history which included three previous male assaults female and four violence charges.
"It's a volatile relationship characterised by violence ... I can't ignore the past of repeat violent offending. We know how seriously the community takes family violence. I must too take it seriously ... the risks at this stage are too high."
He sentenced Wall to nine months' jail with six months' post-release conditions to undertake family violence and drug and alcohol counselling.
"You may not accept or understand this sentence but this gives you hope for the future," he said.
