All three were with a group drinking in the Taradale Club in Greenmeadows after attending a Christmas function for staff of construction and engineering company Downer on the night of December 17 last year. Akuhata was employed by a firm contracting to the company.
Judge Rea said it was clear Akuhata resorted to violence to deal with issues, apparently more so when alcohol was involved, and in the last 10 years had been in court eight times for violent offending.
Charges in the past include injuring with intent to injure, assaults with weapons, and in 2003 a series of charges to which he pleaded not guilty including assaulting a police officer and injuring a police dog which he hit with a padlock from a gate.
At the time of the assault nine months ago, Akuhata was still on a sentence of intensive supervision for three charges relating to other violent offending.
Crown prosecutor Jo Rielly accepted defence counsel Eric Forster's contention the consequences for Mr Mitchell were not intended but Judge Rea said Akuhata had "essentially" ruined Mr Mitchell's life.