Olly's dad, Cliff, says despite a sprained wrist, Olly decided to compete for the full-contact title the following day.
"He sprained his wrist and he went against the best in New Zealand. I walked away going, if he can deal with that situation, which was high pressure and he handled it all himself, then I'm thinking he's going to handle life pretty well," he says.
Cliff says he's really proud of his "tough little dude".
"He's there fighting other kids and [his mum's] scared that he's going to get hurt, but my fear is more for the other kids because I think he's really pretty tough," he says.
"You wouldn't go in with one arm if you didn't think you were [going to win]."
Olly still used his sprained arm to block kicks to his head during the full-contact fight.
"He said to me he felt like he was going to pass out when they kicked him and he blocked them with it," he says.
You wouldn't go in with one arm if you didn't think you were [going to win].
Olly has been practicing karate since he was 4 and will be graded for his black belt in three months.
He says the discipline made him want to do karate, though that's not his favourite part. Olly loves the various activities they do in training.
"Sometimes we do little sparring [sessions] and stuff. Self-defence as well."
The spinning back-kicks are his favourite move and he trains three times a week for an hour at Tauranga Primary School.
Cliff says the community around Olly can take credit for his success at nationals.
"Me and [his] mum play a small part, but if it wasn't for his coach, the teachers at school, his soccer coach ... if it wasn't for all these people imparting into his life, on the field telling him to be determined in soccer, he'd never have gotten to that moment there and gone 'I'm going to do this because I can get a New Zealand title'. It's massive."