The rescuers, with some people who were already with the man, managed to get it off him.
"He was relatively unhurt once it was off him. By moving the boulder, they could have made it a lot worse.
"They were careful not to crush him."
He was taken to Grey Base Hospital with "not significant" injuries.
As Mr Shaw was bringing him in about 1pm, he heard they may be needed at Blackball.
A woman on a tour of Ford Creek, to look at historic relics, had collapsed.
She too was aged 66, from Christchurch.
As she was down a gorge, the helicopter winched her out.
She was not seriously ill.
After landing, they flew to Westport to bring back a man with a "reasonably serious" medical condition. He too was aged 66.
Mr Shaw said they did not even shut down the engine between the first two rescues.
- The Greymouth Star