Police have issued a stern warning to Melbourne's anti-lockdown protesters after a fearsome response to an underwhelming rally yesterday.
He said his son had gone to the Northern Hospital Epping for treatment before running outside to meet a work colleague, which prompted hospital staff to call the police.
His father, Glenn Atkins, has called for the senior constable who kicked his son's head to be fired from Victoria Police.
"They put him in a coma so they could do a CT scan on his head, because he was stomped on or kicked by police", Atkins said.
Bystander footage of the arrest, obtained by 7NEWS, shows police driving a vehicle into Atkins, who was thrown several metres.
"Tomorrow the police will be on the back foot, and we'll be able to rise".
"It is like watching a video from America or Beirut", he told the Herald Sun newspaper.
Authorities will block essential arterial streets in Melbourne together with checkpoints since they attempt to prevent people going into the city to protest, even while the authorities will also keep a solid presence around essential landmarks like the Shrine of Remembrance.
The man's lawyer, Jeremy King, told ABC News that his client had not committed a crime and was in a "vulnerable" state at the time of his arrest.
He said "using a kicking action or any action against the head of a person is not trained by Victoria Police, that is outside of our accepted training within Victoria Police".
Victoria Police said its officers were called to reports of a man behaving erratically in the suburb of Epping at about 16:10 (06:10 GMT) on Sunday.
Scuffles broke out as arrests were made.
An investigation is underway into the man's arrest by the Professional Standards Command.
The arrest was not related to a breach of coronavirus restrictions, the spokesperson said.
Have there been other police controversies?The state capital, Melbourne, has been under strict lockdown for six weeks. Some incidents have sparked public anger.
The arrest has been widely criticised online after garnering thousands of views. Social media videos have also captured other confrontations.
Victoria Police said in a statement that there were between 200 and 250 people involved in the protests, but there were no immediately known injuries to the police. In Australia, that has focused anger on the disproportionate number of deaths in custody among Aboriginal and Torres Strait Islander people.