Defence agent Stuart Flowerdew said: “It largely centres around earlier in the day being visited by this individual in his cell.
“He felt threatened and what happened with the assault itself was in response to that.”
Sheriff Andrew Miller told Watson, of HMP Grampian: “I need to take into account the significant injuries you inflicted on this man, who required surgery and the insertion of metalwork to repair this fracture to his jaw.”
The sheriff ordered Watson to be jailed for a further 12 months.
This article originally appeared on the Evening Express website. For more information, read about our
new combined website.