The young person pleaded guilty to aggravated assault following a swarming incident where the victim was repeatedly stabbed with a box cutter.
The youth court judge imposed a sentence of two years' probation.
The Crown appealed the sentence.
The Court of Appeal allowed the appeal, finding the probation sentence demonstrably unfit given the seriousness of the violent offence, the young person's role as the ringleader, and the devastating impact on the victim.
The sentence was varied to a nine-month custody and supervision order followed by six months' probation.