The Crown says a man who was punched on an Auckland street got up and walked away, but died a day and a half later.
Israel Te Amo has denied a charge of manslaughter and is on trial at the High Court in Auckland.
Crown prosecutor John Dixon said Mr Te Amo came across Darryl Nicholson on a street in Orakei in 2012.
He said Mr Nicholson called Mr Te Amo a name as a joke. Mr Te Amo punched him in the jaw and knocked him to the ground.
Mr Dixon said Mr Te Amo had to be held back by a friend from continuing with the violence and left shortly afterwards.
The prosecutor said Mr Nicholson got up and brushed himself off and left too.
Over the following day and a half, bleeding on his brain caused swelling and Mr Nicholson died.