Star athlete Michael Brusnahan jailed over horrific kick to man's head outside Semaphore Palais

Graphic footage has emerged showing the moment an aspiring Olympic sprinter kicked a defenceless man tending to a stranger in the head - leaving him with brain damage.
Michael Kerry Norman Brusnahan, 23, will spend a minimum one year behind bars after being found guilty of assaulting two men in a drunken rage outside an Adelaide hotel in 2014.
One of the victims was left with life-threatening injuries after a topless Brusnahan strode over to him and viciously kicked him in the face as he tended to another man, who was also attacked.
Brusnahan faced up to 15 years in jail after he admitted to recklessly causing harm, but instead received a three and a half year sentence due to his age and rehabilitation prospects, The Advertiser reported.
In the body-camera footage tendered to court, Brusnahan can be seen tussling with security guards after he was asked to leave the Semaphore Palais.
A man in a blue shirt tries to intervene but is 'coward punched' in the back of the head by Brusnahan which sends him to the ground.
Another man leans over and tends to the man as Brusnahan calmly returns with his t-shirt slung over his shoulder.
He then coldly lines up the defenceless Good Samaritan and kicks him in the face 'like a football'.
The man's head violently jolts backwards, before his body goes completely limp and slumps to the pavement.
Brusnahan quickly flees the scene after delivering the sickening blow.
The man lay unconscious for up to five minutes and was left with a fractured skull, causing post-trauma amnesia and no memory of the attack, according to The Advertiser.
Brusnahan was celebrating the end of football season the day before his 21st birthday party when he launched the savage attack.
The 23-year-old - an apprentice carpenter by day - is also a talented state champion athlete who narrowly missed out on Rio Olympics selection.
He faced up to 15 years in jail after he admitted to recklessly causing harm, aggravated assault and a range of other offences.
Judge Wayne Chivell said Brusnahan was young and remorseful, but jail was the only option due to the community's stance on violent attacks.
The 22-year-old victim has 'moderate to severe' brain injury, as well as being highly traumatised and stressed, the newspaper reported.
'It is not being overly dramatic to observe that it is pure luck that you are not facing a murder charge here today,' Judge Chivell said as he delivered Brusnahan's sentence.
'It has happened many times before that (and) that was the outcome.'
The mother of the victim pleaded in a pre-sentencing statement for similar attacks to stop.
'I am concerned for the safety of all young people and the risk of them being injured or worse, because of reckless behaviour and alcohol-fueled violence,' she said according to The Advertiser.
'We thank god that our son was one of the luckier ones.'
The mother said that 'everything changed' from the moment she received a phone call that night, and that her son has undergone a personality transformation.
She said before the attack he was 'very easy going, sociable, friendly, patient, active and adventurous.'
The victim in his own impact statement characterised himself now as 'confused, stressed, frustrated and on edge.'