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Officer 'feared he would be killed' after being attacked by own baton
The 34 year-old launched the brutal attack despite a police dog sinking its teeth into Davies.
The assault only ended when a badly wounded PC O'Donnell was able discharge incapacitant spray into his eyes - although Davies still later went on to kick another officer.
He is now behind bars after he admitted his guilt during a hearing at the High Court in Glasgow.
Davies had fled a house after an argument with a woman there had led to police being called.
PC O'Donnell - a trained dog handler - went on to find Davies in a desolate area of nearby woods that night.
The tattooed thug yelled at him: "You are not going to arrest me." He continued to be aggressive as the officer tried to calm him.
PC O'Donnell shouted: "Police with a dog. Stay where you are or I will send the dog."
But, instead, Davies ran at the constable, wildly swinging punches while screaming: "Let it bite me."
The dog repeatedly got hold of Davies, but the thug still lashed out hitting PC O'Donnell.
The officer tried to sweep his legs away and pin him to the ground.
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PC O'Donnell called for back-up before Davies grabbed his body armour and was on top of him.
Prosecutor Stewart Ronnie: "PC O'Donnell struggled to escape. They both rolled down a hill and the officer ended up in a seated position.
"Davies stood behind and began to strike blows on top of his head.
"The officer noticed these were significantly stronger than ones earlier.
"When each landed, he saw stars and felt significant sharp pain on his head. PC O'Donnell was now in fear of his life."
The constable was stricken on the ground as crazed Davies then bit through the top of his ear.
He was unable to defend himself, but eventually managed to wriggle free.
It was then PC O'Donnell was able to push Davies away and discharge his incapacitant PAVA spray into his eyes. Two other officers then turned up to help their bleeding colleague.
The court heard, after Davies was arrested, PC O'Donnell "collapsed to his knees, dizzy, exhausted and in severe pain".
He was then taken to hospital. It emerged he had been repeatedly whacked with his police baton.
PC O'Donnell luckily suffered no fractures, but has been left scarred for life from the injuries.
He was off work for four weeks and continues to receive trauma counselling.
The officer remains conscious of his scars.
The court heard that, after Davies was held, he booted another officer while in the police van.
Davies - who already had convictions for violence - pled guilty to assaulting PC O'Donnell to his severe injury and permanent disfigurement.
He had initially faced an attempted murder allegation.
Mark Stewart KC, defending, said Davies realised he should have stopped when faced by police, but that "one thing led to another and matters got out of hand" that night.
Lord Mullholland remanded Davies in custody as sentencing was deferred for reports.
The judge told him he would have been looking at a jail-term "well into double figures" had he been convicted of the original charge, but that he was still facing a "significant sentence".
