Prosecutors say there is "no doubt" the man they put on trial after a drunken fight is responsible for the blow that left a Canberran with a skull fracture and brain injury.
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The Crown has argued CCTV shows Levi Freeman-Quay, 26, put his full weight into the strike, knocking out the victim, and causing him to fall back and hit his head on the concrete in the early hours of a Saturday morning in 2013.
Prosecutor Sarah McMurray gave her closing address to Chief Justice Helen Murrell, in the fifth day of Freeman-Quay's ACT Supreme Court trial, submitting the vision clearly showed the accused's body rotate as he delivered the blow.
"That, in essence, with that force behind it... renders a massive strike," she said.
The crime is alleged to have occurred during a drunken scuffle between two groups in Civic on September 21, 2013.
The two groups are shown exchanging words out the front of the ActewAGL building on Bunda Street, before the victim's group walks away.
Freeman-Quay follows them, and grabs the hood of one man's jumper, pulling it backwards.
A scuffle then breaks out, and the victim is shown trying to headbutt one of the opposing men, who grabs him in response.
The Crown say that is when Freeman-Quay delivered the forceful punch.
Ms McMurray said that, while the victim was lying on the concrete, Freeman-Quay continued his aggression, punching another in the group before being taken away by friends.
She said others at the scene were shocked by the noise of the victim's head hitting the ground and had stopped to look at him.
Freeman-Quay has been charged with recklessly inflicting grievous bodily harm, an alternative charge of causing grievous bodily harm, and a common assault against another of the victim's friends.
But Freeman-Quay's barrister Ken Archer told the court there were four issues complicating the allegation, including whether his client actually delivered the blow.
He argued Freeman-Quay's acquaintance - the target of the attempted headbutt - punched the victim once or twice and contributed to his fall to the concrete.
That, he said, required the court to exclude the other man's conduct as a possible cause of the grievous bodily harm.
Mr Archer also argued there would be issues surrounding his client's "recklessness", his
Ms McMurray earlier argued that Freeman-Quay could not argue reasonable self-defence.
She said he initiated the violence and said the blow was not proportionate to the threat posed by the victim.
The prosecution is also preparing written submissions to the court on how self-induced intoxication factors into the case.
The judge-alone trial before Chief Justice Murrell has been adjourned and closing submissions will continue in July.
