A wall of people began coming towards his group, which included his brother Kiore Ronaki and his brother's partner in an "aggressive and threatening" manner, he said.
He insisted that he was unaware Abbott had been stabbed until police questioned him at the Tauranga police station and repeatedly denied he had intended to hurt anyone.
Rocky Ronaki was acquitted on a further charge of assault against a female patron.
His brother Kiore Ronaki, 29, was also found guilty of one charge of assault with intent to injure after a female patron was punched unconscious by at least two blows.
Kiore claimed he had only thrown "one punch" after stepping in to defend his partner.
He was found not guilty of a further charge of assault with the weapon, namely the knife.
Kiore Ronaki, who the Crown alleged was a party to the stabbing incident, was discharged on that matter by Judge Thomas Ingram part way through the trial.
Judge Ingram said he was satisfied there was no evidence Kiore knew his older brother intended to brandish the knife or use it to cause serious harm to anyone.
Crown prosecutor Richard Jenson successfully argued there had been "nothing defensive" about the brothers' actions and the force used went well beyond what was reasonable.
Lawyers for the accused argued that the Crown had failed to prove beyond reasonable doubt their clients were not acting in self-defence.
Some Crown witnesses' evidence was "unreliable" due to their intoxication, and one witness accepted she could have been mistaken about who did what that night.
Judge Ingram sentenced Kiore Ronaki to 18 months' prison but due to time spent behind bars awaiting trial, he will be released back into community almost immediately.
Rocky Ronaki was remanded in custody for sentencing on November 14.