But undeterred by his tumble, the man charges down the street with the trolley once more as the altercation moves across the road. "He is someone who is accordingly known to Victoria Police and the federal intelligence agencies", he said.
Police were forced to shoot the attacker after he launched a frenzied tirade against civilians and first responders.
One dead and multiple people were hurt in a rush hour stabbing incident in Melbourne's central business district, police said Friday, after they apprehended a suspect near a burning vehicle.
The bomb response unit is on the scene, conducting safety checks on the vehicle.
Footage shows the man, wearing a long sleeve black shirt and white trousers lunging at three officers.
The suspect punched an officer and threatened them with a knife.
The Somali-born terrorist was brought down by Victoria State Police after confronting officers on a busy inner city street in the state capital, authorities said.
"Passers-by were calling out that members of the public had been stabbed", he said.
He later died on the operating table.
Witnesses told The Age they were shopping in the area when they saw a man throw what they believed to be a bomb into a auto before it exploded.
"I didn't know what was happening there was just so much chaos and screaming".
Photographs from Bourke Street show a white sheet covering a body, with a bare foot protruding.
Another man was also seen on footage using a chair and attempting to hit the attacker with it.
But the sturdy trolley-pusher, who is wearing a black T-shirt, picks himself up and tries to intervene again by pushing the trolley towards the suspect. Meanwhile, a vehicle can be seen blazing on the side of the pavement at the scene.
Users on social media have reported hearing an "explosion", while vision of the incident has suggested a man attacked police with a knife, before seemingly being shot by an officer.
Extra police officers are likely to attend the events.
"There's no known link to terrorism at this stage". We want to keep our journalism open and accessible and be able to keep providing you with news and analyses from the frontlines of Israel, the Middle East and the Jewish World.
Police later said the auto from which the slain suspect, a Somali national, had emerged, contained gas cylinders and was on fire when they arrived.
The driver then got out and began stabbing pedestrians in a terrifying frenzy, injuring two and killing one, police say. One had a head injury and the other suffered a neck injury, according to The Age. He was taken into custody in a critical condition. The third has unknown injuries.
Two other people are in hospital after being stabbed in a busy Bourke Street on Friday afternoon.