Initially thinking he was having some quiet time, or had walked out of the paddock from the other side, he was unconcerned.
But with gumboots and by torchlight, they discovered a 10-15m drop off on the other side of the fence, and at the bottom of the paddock, found Berry face down with half his body submerged underwater. Emergency services were called where he was pronounced dead.
His blood alcohol reading was 168 milligrams per 100ml of blood, which was considered to have contributed to his drowning following the fall.
The legal limit for a driver 20 years old or over is 80 milligrams per 100ml.
A post-mortem examination revealed the cause of death was drowning, although the pathologist noted a minor head injury received in the fall could have contributed to his ability to pull himself from the water.
"At the time he climbed the fence Jamie was agitated and angry, and under the influence of alcohol," the coroner's report stated.
"His cousins, with whom he had been socialising the previous evening, responsibly took all reasonable steps to stay with him and get him home safely, but Jamie managed to get away from them, and tragically fell to his death."
No recommendations were made.