Bradley Frost, 63, was attacked outside his Modbury home about 3pm yesterday.
One of the attackers yanked a star picket out of the ground before Frost was allegedly assaulted.
Abuse was allegedly hurled at Frost while he lay helpless in the middle of the street.
“How does it feel to be knocked the f— out?” the attacker allegedly said.
Within minutes the pair had fled the scene on their bikes as a neighbour tried to chase them down.
Frost was left fighting for his life on the road with critical head injuries.
“Help please, someone call an ambulance,” his brother can be heard calling in security footage.
“Ambulance is coming, I’m already on the phone,” a neighbour says.
A neighbour, Niranjan Dasari, said Frost suffered a serious head injury and was gasping for air.
”He was unconscious. People were asking him to say his name or something to respond and he wasn’t responding,” Dasari said.
Read Related Also: Busy mum who suffered post-natal depression now making millions with DIPD Nails
Frost was taken to the Royal Adelaide Hospital where he remains in a critical condition.
Family members gathered at Frost’s home today and told 9News they’re afraid the 63-year-old won’t survive.
“I hope he recovers because he doesn’t deserve this,” Dasari said.
A man was arrested at a Modbury North home yesterday afternoon.
He has been charged with aggravated assault causing serious harm.
The man faced court this afternoon.
The hunt is still on for a second man who is described as being of Aboriginal appearance, wearing a white singlet, dark-coloured shorts and a white baseball cap.
Police said they don’t believe it was a random attack.
The investigation continues.