A man who took a "massive" amount of Class A drugs heard voices telling him to intercept a terrorist, a court has heard.
Nathaniel Downer said "I was sent by somebody" after he was found by Mohammed Bidari in his home.
Bristol Crown Court heard Mr Bidari grappled with Downer inside and outside the flat in Robinson Drive, Bristol, and Downer left the scene but was arrested. It transpired Downer had underlying psychosis exacerbated by illicit drug use.
The 37-year-old, of North Street in Bedminster, pleaded guilty to burglary and assault on January 26 and he has now been jailed by Judge Michael Longman for 876 days.
He told Downer: "It is impossible to think that you did not realise that there was some mental health background affecting you and it was exacerbated by your continuing illicit substance misuse."
Neil Treharne, prosecuting, said Mr Bidari found Downer in his home and a struggle ensued as he tried to eject him.
The court heard Downer punched him as Mr Bidari asked what he was doing there, to which Downer replied: "I've been sent by somebody."
Downer grabbed a stone and a trowel in the course of the melee but eventually left the scene, leaving his hat at the scene.
Police called in recovered his DNA from the hat and were helped to identify him by the distinctive teardrop tattoo under his right eye.
Downer gave police a prepared statement in which he stated he struggled with Mr Bidari outside the premises and his hat must have been taken inside.
The court heard he had 35 convictions for 81 previous offences, including burglaries with violence.
Daniel Kelly, a probation officer, said Downer had claimed to have heard voices saying Mr Bidari was a terrorist.
He confirmed that, before the incident, he had consumed £100 worth of crack cocaine and £100 worth of heroin.
Mr Kelly told the court: "This would have been a staggering amount."
Mr Kelly assessed Downer as being a high risk to members of the public.
Rodney Wilson, defending via video link, said: "He was acting at the time under a mental health condition. He went in when he appears to be suffering with an underlying condition which was obviously exacerbated by his massive drug use."
