He said he used his arm to "fend" off Mr Dawson, who was "angry, loud and aggressive" after he got into a fight with another group of men outside the bar.
Murray said he was very remorseful, but had been trying to help Mr Dawson and vigorously denied throwing a punch.
Several witnesses had described the "distinctive, sickening thud" when Mr Dawson's head hit the ground.
When he learned Mr Dawson was unlikely to survive, he panicked during the police interview, Murray told the court.
"No I wasn't thinking straight and yes, I could have been more forward," he said.
He said he also downplayed to police racist comments Mr Dawson had made that night.
Mr Dawson, a Sky TV employee, suffered a fractured skull and died the following day in Auckland Hospital.
The prosecution was expected to begin its closing arguments this afternoon.