Mr Clarke said the boy was doing really well.
"His mum and dad were pretty calm as well, so it was quite a surprise to see him holding up so well.
"He was in a fair bit of pain but we gave him some pain relief and got on top of his pain for him and flew him to hospital.''
The boy would have to undergo scans and X-rays to make sure he had not suffered any serious damage.
Mr Clarke said he had been strapped into a harness and had a helmet on at the time of the accident.
"Unfortunately something's gone wrong and he's fallen off the flying fox.
"It's an awful way to start a holiday, but hopefully he'll get cleared by the hospital today or tomorrow, and still might be able to get on his holiday.''