A witness to a stabbing on a DLR train told police she believed the attacker had a "psychotic episode" and thought his victim was "the devil", a court heard.
Isaiah Idris, then aged 17, was attacked on a DLR train in London in the early hours of November 1 last year, Cambridge Crown Court was told.
Anthony Williams, 33, denies 14 counts of attempted murder: ten of them in relation to an incident on an LNER train in Huntingdon, three said to have happened in Peterborough and one relating to the incident on the DLR train.
Earlier this month, Williams pleaded guilty to 10 counts of wounding with intent relating to the LNER train incident, the wounding with intent of a man at Pontoon Dock DLR station in the early hours of November 1 and to the wounding with intent of a 14-year-old boy in Peterborough on October 31, as well as a number of other offences.
In a video-recorded interview played to jurors on November 3, a witness who was on the train said that the attacker "was specifically targeting a boy".
She said: "There was nobody to help, we were very much on our own.
"We didn't have anything to defend us.
"It was a very scary moment."
The witness added that it appeared to her that the attacker had "a psychotic episode".
She said: "He was seeing things that weren't clear to the rest of us.
"The attacker for some reason thought that this boy was the devil and wanted to harm him."
The witness added that the attack was "completely out of nowhere".
Judge Mr Justice Calver earlier told jurors that whether Williams carried out the attacks is not in question, but they must consider whether he intended to kill those individuals when he carried out the attacks.
The trial continues.
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