"There was definite evidence of puncture wounds through his scalp, to the right side of his head.
"There were additional puncture wounds to the left … cheekbone, jaw … corresponding to a bite. The animal has bitten the top of his head with his jaws either side [of his head]."
He said the man also sustained wounds to his right shoulder and finger on his left hand.
"The gentlemen explained he was swimming … and suddenly felt this impact, clasp on the top of his head, which he recognised to be a crocodile," Sweeney said.
"He put his hands into his jaws to prise them off his head and it let go and the jaw snapped shut on his left forefinger.
"There was minimal blood loss. No breaks or fractures to the skull.
"He was a fit individual and grateful that it was not as serious as it could have been."
Sweeney said the man took a "slow swim" back to the bank to get help but feared he would be attacked again.
"He was concerned that the animal would attack him again," he said.
"He is a very lucky man. It could have been worse."