Dad who admitted assault at risk of jail, says judge

When Aaron Robert London Kelly heard a man had allegedly assaulted his son, he went around to the man's home, abused him and then knocked him out, banging the victim's head on a concrete step while he was unconscious.

Kelly was told by Judge Barbara Morris he was "at risk of imprisonment" for his behaviour.

The 43-year-old Eketahuna man pleaded guilty in Masterton District Court recently to a charge of injuring with intent.

Police prosecutor Sergeant Garry Wilson said on October 26 about 7pm, Kelly went to the victim's home confronting him about hitting his 14-year-old son in Eketahuna earlier in the day.

"He was confrontational, yelling abuse ... [Kelly] grabbed his clothing pulling him and he landed on the concrete. He continued punching him in the head an unknown number of times [Kelly's] hand began hurting so he used his other hand to continue punching the victim," Mr Wilson said.

Kelly threatened to kill the victim as he knocked him unconscious.

"He yelled he was going to kill him as he banged his head on the step."

The victim's wife intervened and was also hit before Kelly got in his car and left the scene of the attack, he said.

The assaulted man suffered cuts to his head, grazes to his knees and was taken to hospital for treatment.

Kelly admitted the assault, Mr Wilson told the court.

"He stated he was angry because he had hit his son earlier in the day. He said he wasn't remorseful."

Defence lawyer Peter Stevens said his client had not hit the victim's wife - only pushed her away.

"He does not have a history of this manner."

Judge Morris remanded Kelly on bail for a pre-sentence report to assist with sentencing on February 3 but warned him jail was a possibility.

"All options are available to the court ... he is at risk of imprisonment," she said.