An enraged Eruera - intent on revenge - grabbed his Mongrel Mob vest and his wife drove him to the party, picking up Taki on the way, Mr Hollister-Jones said.
Brooklyn Orsmby-Ratahi and Ihareire "Guy" Wikeepa were walking on the footpath on Ohauiti Rd after leaving the party when the car carrying the three accused stopped beside them.
Taki hit Mr Wikeepa on the back of the head with a metal bar after he approached the car and Eruera stabbed Mr Ormsby-Ratahi, Mr Hollister Jones said.
Eruera's wife stayed in the car but encouraged her husband during the attack, yelling out: "Kill 'em babe", he said.
As they left, Eruera threatened the two men to keep quiet or "they would be killed".
The trio then continued on to the Mansfield St party address. Eruera entered the house wearing his Mongrel Mob vest. He brandished a knife at the occupier of the house.
Taki, holding the metal bar, stood in the doorway in support and, after a brief altercation inside, Eruera went looking for Mr Tiepa-Ranapia, he said.
The Crown says after Eruera located the deceased he stabbed him once on his left side of the neck which penetrated 10.5cm deep and nicked the jugular vein.
"There is no question this was a swift and purposeful attack," he said.
Mr Tiepa-Ranapia, bleeding profusely, walked about 300m before he collapsed and died outside a nearby address, he said.
Mr Hollister-Jones said Eruera's wife was charged as a party to the murder and the other two charges because she had actively encouraged her husband during his "revenge mission".
Taki is also charged as a party to the murder.
The trial, presided over by Justice Christian Whata, is expected to take three weeks.