A crazed mum who had been 'drinking heavily' and smoking Spice was 'foaming at the mouth' when he attacked a police officer in Piccadilly Gardens - as people 'screamed and cheered as if they were at a football match'.
Petra Clyde, 41, sunk her teeth into the left forearm of a female officer during a struggle as she tried to detain her for assaulting another woman.
Onlookers began 'screaming and cheering as if at a football match', a court heard.
A shocked passer-by eventually stepped in and held down Clyde's legs while the officer broke free.
The PC was later treated for a 'human bite wound'.
She had to have a hepatitis and tetanus jab. The cop said she'd never been so frightened in her 13 years with Greater Manchester Police.
Clyde later accused the officer of attacking her sister.
The witness who stepped in said: "The crowd was screaming and cheering and it was disgusting.
"The woman being arrested was foaming at the mouth and looked like she was on drugs, yet the crowd were acting as if they were at a football match.
"I was disgusted at humanity that no one was helping the officer."

At Minshull Street Crown Court, mum-of-one Clyde, of Huddersfield Road, Stalybridge, Tameside was jailed for two years.
The court heard the incident happened on August 22 last year.
Clyde and her twin sister had been drinking heavily and taking Spice while police were helping marshal protesters demonstrating against child abuse.
Prosecutor Neil Usher said: "A member of the public notified two police officers that this defendant and her sister were assaulting another female.
"The two officers saw the women over a female, who was lying on the floor and being repeatedly punching the victim.
"The PC describes how the twin sisters are well-known to the police for their anti-social behaviour and because from their experience, the two sisters use Spice and abuse alcohol.
"The officers intervened, but this defendant resisted arrest and struck the PC in the face. When the female officer tried to get her handcuffs, the defendant ran away but then returned to the area.
"The PC again tried to place her under arrest but was punched.
"The defendant then tried to kick and punch the officer before succeeding in biting her forearm causing bite marks which bled. The bite lasted five seconds and the officer utilised her CS spray.
"The other officers attended and the officer was treated for her injuries at the MRI.
"The report from the hospital said that there was a human bite mark due to skin loss. The doctors were unable to close the wound and because of the high risk of infection, she was given hepatitis B booster and the tetanus jab as well as antibiotics.
"The defendant admitted biting the officer in interview, but said it wasn’t on purpose as the officer had put her weight onto her. She said the victim had originally been attacking her sister, she denied being intoxicated and on any form of drugs.
"This attack took place in a very public place and led to a reaction from some members of the public who were there, which would have made the incident more difficult for the officers.
"It was shortly after that the public concern over the George Floyd incident and that seems to be referred to by some of the public as heightening the tension – but maybe they didn’t exactly know what was going on.
"Miss Fogarty saw the incident and was very concerned and helped intervene by restraining the defendant’s legs as she worried the officer was going to be further hurt."
Defence counsel Rachel White said: "She is a vulnerable person and her lifestyle choices make her even more vulnerable. She expresses her regret and she understands that she overreacted in clearly using violence to remove the officer from her.
"She has led a life led by loss, but says she wants to get back to her family and to begin to make changes.''
Sentencing Clyde, Judge Anthony Cross QC said: "Police officers have the hardest job imaginable in trying to police Manchester’s Piccadilly.
"The PC says in her own statement that she was as frightened as she has ever been in 13 years in the job.
"This is a police constable who is currently employed by the police, but she initially gave her service to the city for free out of public duty.
"She then became a police and community support officer and she spent most of her time working in the city centre, so she has seen a lot and she was frightened by you. I’m afraid I would be completely failing in my public duty, were I not to send you to prison.
"This was a serious incident, which could have been much worse.''
Clyde admitted assault occasioning actual bodily harm; and resisting arrest. She was also issued with a five-year Criminal Behaviour Order.