She said the Crown alleged Heenan approached Mr Newton from behind and stabbed him with either a large carving knife, a Leatherman tool or both when Mr Newton began "conjuring up gods" and "calling his warriors from the heavens and the eighth plane".
Mr Newton's aorta was severed and he would have died within as little as 30 seconds, she said.
Ms Gordon said Heenan then jabbed himself with a knife, inflicting six superficial wounds to his abdomen and one to his arm, in an attempt to make it look as if he had acted in self-defence.
She said in the months following Mr Newton's death, Heenan gave people different accounts of that night, saying he didn't remember what happened, that Mr Newton had stabbed him first or that there was a third person involved.
Ms Gordon said Heenan admitted to a man in January 2008 he had "killed the f****** n***** and he was proud of it".
He told the man he had delivered a "kill shot" to Mr Newton and the story about a third person was "just a story for the pigs [police]".
The man, whose identity has been suppressed, will give evidence for the Crown during the trial.
Ms Gordon said the issues were whether Heenan acted in self-defence and, if not, whether he had murderous intent. She said forensic evidence from the scene would show Mr Newton did not attack Heenan and Heenan's wounds had been self-inflicted.
"I will be asking you to follow the blood because if you do that, if you follow the blood, you will be able to answer ... who stabbed who first."
Defence lawyer Simon Lance chose not to make an opening statement yesterday.
The trial is expected to take two weeks.
