A teenager armed with a baseball bat who tried to stop the Melbourne car rampage says he's not a hero because he couldn't save the five people who died.

Tevita Mahina, 17, was filmed running into the middle of the road outside Flinders Street Station as Dimitrious Gargasoulas, 26, drove screeching doughnuts around the busy intersection.

Moments later, the crazed driver sped down Bourke Street mall mowing down dozens of pedestrians, killing five people and injuring 37 others.

"I didn't save anyone so I don't feel like a hero," he told Daily Mail Australia after the video of his actions on Friday went viral on social media.

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The ones who attended to the victims are the heroes. I'd do it again in a heartbeat but I regret not doing more to drop him.

"I wish I could have stopped him, look at the five who have passed away I hope their loved ones are ok and they will be in my prayers."

The driver of the car that killed five people in Melbourne. Photo / Herald Sun
The driver of the car that killed five people in Melbourne. Photo / Herald Sun

The 17-year-old said he was in the city with some friends and brought a bat and ball to hit around when they saw the car with its driver yelling "f*** the world" and branded those watching "sheep".

"Me and my mate saw him doing something and yelling stuff out the window and swearing so we just went," he said.

"We just saw him do something which looked like he was about to hurt the people around that corner so we just decided to go."

Tevita and his friend Isaac Tupou, also 17, ran into the road and the brave teenager tried to break the car's windscreen but were almost hit when it skidded towards them.

"Looking back it was a little scary but to be honest you don't really think about it at the time, it kind of just happened. Everything went really fast," he said.

Meesha Rhodes Ali, who filmed the footage, told The Project: "They were pretty brave.

"I believe they were trying to stop him because at one point he stopped right in front of us and as he came around he nearly swiped them right off the road.

Mourners leave flowers and tributes to the victims of the Melbourne incident. Five people, including a three-month-old baby boy, have now died. Photo / AP
Mourners leave flowers and tributes to the victims of the Melbourne incident. Five people, including a three-month-old baby boy, have now died. Photo / AP

"When I saw that I just thought this guy is out to kill someone. We didn't know if he had a weapon with him, if he was going to pull out a gun ... It was really crazy."

At the end of the footage, the maroon Holden can be seen taking off down Swanston Street, where it mounted the pavement before turning left into Bourke Street Mall.

The carnage stopped around Elizabeth Street after police shot the driver and dragged him from his vehicle.