"That fella's taken rugby away from me. I get headaches every day because of him."
Mr Chisholm said he was still seeing a neurologist and was booked in for another MRI scan to establish the extent of the damage.
"If I get another smack to the head I could die. That's what they [doctors] have told me. I want to play footy more than anything but I've got two kids and I'm not going to put that on my kids, no way."
Mr Chisholm was still a part of the Te Puke Sports premier team but did not play competitively.
"There are people out there that think doing this kind of thing is acceptable.
"People don't realise their actions and what they can do to people," he said.
"I still have to go home for a sleep every day."
Mr Chisholm, whose job is to look after troubled youth at Tauranga Boys' College, said Pieta was a "coward" to punch him from behind.
Defence counsel Rachael Adams told Judge Bidois Mr Chisholm provoked her client with offensive language and deliberate taunting.
Pieta had responded impulsively "without any thought of the consequences," Ms Adams said.
Her client accepted he brought shame and dishonour on himself and the Te Puna community, she said. Pieta was also banned from playing rugby for 12 months after an independent Bay of Plenty Rugby Union judicial process.
Pieta's family refused to comment outside the courtroom.
Mr Chisholm was not aware of Pieta's sentencing until the Bay of Plenty Times contacted him yesterday. The officer in charge or court advisers are usually responsible for contacting victims.
A Justice Ministry spokeswoman said court staff generally contacted victims after a sentencing to let them know what had happened. They did not inform victims of crime of upcoming sentencing dates unless the victim asked them to.
Court advisers tried calling Mr Chisholm yesterday after sentencing but could not contact him. Inspector Clifford Paxton said various parties had responsibility for liaising with victims, depending on the case.
"We will need to liaise with the parties involved in this particular case to ascertain why the victim wasn't notified on this occasion."