A killer sparked a prison hostage situation after attacking a fellow inmate he accused of stealing a phone.
John Chawner, 43, pounced on Christopher Law in his cell at HMP Shotts in Lanarkshire on October 23 2021. He bound Law's hands and feet together, punched and kicked him before striking him with a broken toilet brush.
Jail staff were only able to get Chawner out around an hour after the attack started.
Chawner was in Shotts having been jailed for a least 15 years in 2008 for murdering a man in Glasgow's Blackhill in a row over an apparently stolen lawnmower.
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He has now had six years added after he pled guilty today to abducting and assaulting Law to his severe injury and permanent disfigurement.
Prosecutor Angela Gray told the High Court in Glasgow how there had been "ill feeling" between the men. Chawner initially went into Law's cell with another inmate.
A guard attended at one stage, but did not go in and instead allowed associates of Law to enter.
Chawner was eventually alone with Law, who was brutally set upon. Staff became aware of the attack, but Chawner warned he was not letting Law go.
Miss Gray: "He refused to co-operate and threatened to further harm him."
After negotiating with Chawner, Law was eventually freed before the killer was also taken out the cell.
Law suffered a number of wounds and cuts. He claimed what happened was over "prison stuff".
Kris Gilmartin, defending, today said Chawner believed Law was involved in his prison issue mobile phone being stolen.
The lawyer added: "As a result, he was not able to stay in contact with his family.
"He was also put on report for losing a prison issue phone.
"On October 23 2021, he went to seek retribution."
Lord Colbeck cut the sentence from eight years due to the guilty plea.
The judge told Chawner: "This paints a picture of a sustained and, frankly, sadistic attack."
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