There was rubber from tyres that had blown out and the black skid marks ran off the seal digging welts into otherwise tidy grass.
Robins heard a man telling the people gathered to leave and it sounded like the group gathered were being cheeky back, he said.
"I definitely heard him say, 'you need to get out of here'."
Then surreal scenes unfolded as a steamroller allegedly started pushing cars around.
"I was in awe," Robins said. "I was like 'holy cr*p'."
"My mind was going like a 100 miles an hour. I didn't know what to think."
But he said he was not scared because it seemed like cars rather than people were allegedly being targeted by the steamroller.
He also pointed out that he believed the steamroller was moving at a low speed.
People did start scrambling back to their cars, he said.
"I thought, 'I've seen enough, I am out of here'," he said.
"I walked back to my car and took off."
Police say one person sustained leg injuries and another suffered facial injuries after an altercation that ensued.
Two men were arrested after the incident, one who appeared in court yesterday where he was granted interim name suppression.
"As this matter is before the courts police are limited in what further information can be provided," a police spokesperson said previously.
"However, it is clear this was a serious incident which had the potential for tragedy.
"We urge anyone who notices activity that concerns them to contact police straight away, rather than taking actions which might put themselves and others at risk."
National MP Judith "Crusher" Collins has previously declined to comment on what happened.
She introduced a law in 2009 allowing police to seize boy racers' cars and destroy them.
The bill earned Collins the nickname Crusher.