Volunteer firefighters who attacked a 17-year-old girl during a brigade training session were not dealt with under Victoria's emergency services assault laws because it is an internal matter.
Flickering CCTV vision seen by AAP shows the girl being pulled to the floor, kicked and left soaked by fire truck sprinklers at the hands of boot-wearing colleagues at the volunteer Eaglehawk Country Fire Authority station in Central Victoria.
The station's captain, Hayden Allen, and three other volunteers have been stood down amid investigations but police said the men will not face criminal charges.
When asked why the attackers were not charged under legislation that incurs tough penalties for people who assault emergency service workers, acting Premier James Merlino said it was an "internal incident".
"And there's a number of processes to deal with this disgusting incident," he told reporters on Thursday.
"Firstly there's a Victoria Police investigation, secondly there's a CFA investigation and at the moment four individuals have been stood down, maybe more, and there's also a WorkSafe investigation."
Mr Merlino, who is also emergency services minister, said Victoria Police "independently, appropriately" made their own determination on charges.
"But that doesn't diminish in any way the significance of this event and the investigations of both CFA and WorkSafe," he said.
Mr Merlino described the behaviour as "sickening" and said there was no excuse for it.
When news of the attack broke on Wednesday, CFA chief executive Frances Diver said the girl did not want to take the matter further.
In a Facebook post Mr Allen said his name had been tarnished in the media but added there were "two sides to every story".
The incident has been referred to the Victorian Equal Opportunity and Human Rights Commissioner while the girl has been offered support by the CFA.
The government has been trying to reform the state's fire services and wants to make the CFA volunteer-only as a way to beat a pay dispute deadlock, but that legislation has stalled in the upper house.
Mr Merlino said the government would return to those reforms in 2018.