"I don't take any s***," Dane Cowley said, explaining punching a man who ended up in hospital for a month with a brain bleed.
Cowley, 21, was sentenced in the Wanganui District Court on Wednesday to seven months' home detention for wounding with intent to injure.
His victim had helped
break up a fight between Cowley and another person at Marton Hotel on April 5 last year.
When the bar closed at 11.45pm, Cowley followed him on to the street, grabbing the neck of his shirt from behind.
Cowley then landed a punch that forced his victim to the ground. Noticing the man was unconscious, Cowley attempted to rouse him before returning to the hotel and his associates and leaving the scene.