His cackling tormentors continue to film the onslaught even as the petrified prisoner rolls up into a ball and begs for them to stop, The Sunday People can reveal.
The attack appears to be an attempt at meting out retribution – with the helpless victim implored to “say sorry”.
Guards are nowhere to be seen.
And the clip was filmed and uploaded to the web – making a mockery of the prison ban on mobile phones and the internet.
The attack was filmed at HMP Featherstone – last month branded one of Britain’s most violent jails after camera phone footage emerged showing an apparent fight club at the prison.
The new footage obtained by the Sunday People was shot at the category C prison near Wolverhampton on November 12 last year.
Last night Mike Rolfe, boss of the Prison Officers Association, said: “It’s a bloodbath in prisons at this minute in time. Staff are absolutely on their knees, lost all morale, all motivation.
“Prisoners are scared. They want prison officers to be in charge, and the prison officers feel incapable to do that.
“Low staffing numbers, people leaving the job in droves, it’s a real bad mix, and it’s dangerous for everyone, staff and prisoners alike.”
Last month justice chiefs ordered an investigation into an illegal boxing matches after Feathertone inmates were filmed squaring off in makeshift rings, surrounded by prisoners baying for blood.
And, in August last year, a major incident was declared as fires were started and guards assaulted in a week-long rampage.
After hostages were taken riot squads were drafted in to stem the unrest, and 20 more officers were hired as a response to the chaos.
Union chiefs said the jail had become ‘one of the most violent’ in the UK and claimed there were up to four assaults a week on staff.
And a report last week revealed a “shocking worsening in standards” on drugs at the prison.
Last week we revealed attacks on prison officers nationwide soared by almost 30 per cent last year as violence spiralled out of control.
Guards were assaulted 6,430 times, compared to 4,963 in 2015.
And the toll of more serious incidents involving broken bones, stabbings and scaldings with boiling water rose to 761.
The Sunday People has led the way exposing the crisis in Britain’s prisons over the past two years. Critics have called for urgent reforms.