"The street was empty and I was sitting in the car texting. I saw three people walking up the street," he said.
He then saw one of the men assault another. That man pleaded guilty to the assault in the Auckland District Court but disputes some of the facts of the case. A disputed facts hearing will be held before he is sentenced, meaning the Herald cannot publish specific details of the assault.
Mr Batchelor said the assault left the victim unconscious on the road.
"I was like 'holy crap'. I waited until the [offender] walked past my car and then I got out to see if the [victim] was okay," he said. As the victim came to, Mr Batchelor helped him into the passenger seat, which he had adjusted so the man could lie down. He considered calling 111 but decided it was quicker to take the victim to hospital himself.
After being diagnosed with Hodgkin's lymphoma in September Mr Batchelor was undergoing chemotherapy and not feeling well.
But he did not hesitate to help the victim.
"Why did I do what I did? I was concerned about the whole bystander effect and I didn't want to be part of that.
"And I was the one sitting there who saw it, so I was responsible," he said. "I couldn't just sit there."
When he knew police were looking for him, primarily to give a statement to support the prosecution of the offender, he came forward as soon as possible.