A 30-year-old man has been found guilty of attempting to behead a stranger at Leytonstone tube station last December.
Muhiddin Mire attacked 56-year-old musician Lyle Zimmerman with a rusty knife and threatened four other travellers as he ran amok in the east London ticket hall.
An onlooker shouted “You ain’t no Muslim, bruv” after Mire claimed he was doing it for “my Syrian brothers”.
Police eventually stopped him with Taser stun guns.
Mire, who was born in Somalia, had apparently been inspired by the murder of Fusilier Lee Rigby.
The attack was caught on CCTV He had images of the soldier and the Islamic State executioner Mohammed Emwazi on his phone, as well as material linked to IS.
The Old Bailey heard the minicab driver, who lived alone on benefits, had a history of mental illness.
Psychosis had led him to believe he was being persecuted for his religion and stalked by MI5 and MI6.
He had been referred to mental health services by his GP a month before the attack.
A jury found Mire, from Sansom Road in Leytonstone, guilty of attempted murder.
He had already admitted four counts of attempted wounding, and an alternative count of wounding with intent to cause Mr Zimmerman grievous bodily harm.
He was remanded in custody at Broadmoor secure psychiatric hospital, ahead of sentencing next month.
Mire targeted Mr Zimmerman as they travelled on the same train from Stratford to Leytonstone on 5 December.
Mire followed the musician off the carriage, producing a black-handled knife with a serrated edge from his pocket.
As Mr Zimmerman approached the barriers, Mire grabbed him from behind, swung him around and on to the floor, and began to kick him repeatedly around the head and body.
A woman nearby was heard calling for him to stop.