This is the shocking moment a vicious cage fighter attacks a police officer who had come to arrest him.
The bodycam clip captures Bobby Mason, 38, hold PC Jack Moorhouse in a headlock and threaten to "rip his head off".
The police constable and a colleague visited Mason's home in Stourbridge, West Midlands, to arrest him for a previous assault that day.
But the yob again turned violent at the address, Birmingham Live reports.
However the bodycam captured the attack and it was used as evidence against the cage fighter.
And Mason was jailed for one year at Wolverhampton Crown Court on Thursday.
He admitted charges of common assault and actual bodily harm relating to the attack, which happened on February 10.
Sex monster abducts and rapes two young women in terrifying 12-hour ordeal
The court heard PC Moorhouse, of West Midlands Police , suffered injuries in the struggle and was taken to hospital.
Mason had asked him if the button on his radio was an alarm, in an attempt to intimidate the cop.
And when he was under arrest, Mason became even more aggressive and tried to punch PC Moorhouse, before grabbing him in a headlock, choking him and refusing to let go.
Helpless gran, 83, died 10 days after vicious gang stole her life savings
Parva spray was used on Mason, weakening his grip on PC Moorhouse.
In interview, he claimed that the officer went for him first, not realising the whole incident had been captured on body worn video.
Detective Chief Inspector Pete Dunn, from the force's Public Protection Unit, said: "This was an horrific attack on a police officer in the line of duty.
"It serves as a reminder to us all of the inherent dangers faced by police officers on a daily basis in our efforts to prevent crime, protect the public and help those in need.
"Mason, a trained cage fighter, would have known his own strength and deliberately wanted to debilitate and harm PC Moorhouse.
"Luckily, Jack wasn’t seriously injured, but no doubt this experience will stay with him for the rest of his career."
