A 48-year-old man is critically ill after a teenage gang attacked him outside his Salford home.
Mr Carroll had been working on his car outside his home
Phil Carroll was working on his car near his Lower Broughton home on Friday when three youths approached him.
He asked them to leave but they threw a stone before Mr Carroll approached the gang and was struck twice.
His brother John, 34, who witnessed the incident, said youths "terrorised" the area but his brother "refused to let them get away with it".
Mr Carroll was taken to Hope Hospital where he underwent brain surgery.
Doctors said he was in a serious but stable condition in intensive care after the attack, which happened at about 2100 BST on Grecian Street North.
Mr Carroll had asked the youths to move away from the alleyway near his home, but they returned later and threw a stone at a nearby garage which rebounded into his Range Rover.
Mr Carroll, a sub contractor for Barclays, chased after them and was attacked.
His brother, John, said: "These kids terrorise the area and as much as the police do a fantastic job, I sometimes think that prevention is better than cure.
"We need to stop these youths drinking because it will always lead to a bad story in the end.
"The end result will be bad as it has been this time.
"I just keep remembering seeing Phil on the floor looking as though he was dying. Thankfully where he is now, at least he has got a fighting chance."
One of the youths is said to be between 15 and 17, about 6ft tall, and was wearing a dark baseball cap and a dark coat.
The second is a white girl, about 15, with shoulder-length dark hair. She was wearing a short dark brown crocodile print skirt.
The third person is a white man, about 17, 5ft 10in and of medium build. He was wearing a waterproof jacket and jeans.
Det Ch Insp Geoff Wessell said: "It is impossible to justify why anyone would choose to carry out such a vicious attack.
"I would like to appeal to members of the local community to help us trace the attackers by coming forward with the names of youths, aged 14 to 16, that were in the area around that time on Friday."