The girlfriend of the accused Bourke Street killer said he vowed to run down people in the Melbourne CBD before she escaped from his car.
Akiir Muo said she was kidnapped by Dimitrious "Jimmy" Gargasoulas, 26, from his Windsor home on Friday morning because she had witnessed his brother's stabbing.
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Ms Muo said she feared for her life as she was driven around by Mr Gargasoulas.
The 25-year-old mother of two said her on-off boyfriend of about five months had stabbed his brother and then threatened to kill her, his mother and himself.
She said Mr Gargasoulas had argued with his brother Angelo.
"I was a witness. I saw him stabbing his own brother and cutting into him because they got into an argument," Ms Muo said.
"He nearly killed his own brother.
"He stabbed him three or four times.
"I was the one who pulled him away from his brother.
"He came and kidnapped me because I saw what happened."
Ms Muo said Mr Gargasoulas came upstairs early Friday morning and kidnapped her from the public housing unit where he lives with his mother.
She said he kept driving around the St Kilda area as she begged him to turn himself in.
"He was saying there's no way in hell I'm letting you out of my sight because you've seen everything," Ms Muo said.
"I had no choice but to go with him because I was scared what he was going to do.
"He might stab me or do the same that he's done to his brother, to me and his mum, because he did threaten me and her [that] if we ever said anything or the police ever came upstairs, he is going to kill himself, his mum and me."
Ms Muo said she escaped from the car on the Bolte Bridge after Mr Gargasoulas felt cornered by police.
"I remember the last words that he told me," she said.
"He goes, 'I'm gonna go to the city and I will run a lot of people down'.
"He was saying something about the comets is coming or it's like the end of the world and saying he is the saviour or he's God - all this crappy stuff."
Ms Muo said she was still in shock.
"I still I can't believe that it did happen because it's not supposed to happen," she said.
"I'm still in shock: did that really just happen?
"At the moment, I'm kind of lost and confused."