It was then back and forth stuff as Australia worked back downfield before Perofeta secured the ball and went back at them, however crucial pushed passes saw the turnover.
The Australians set themselves and wound up with a penalty on the 15m line, with Mason holding his nerve to win the game.
It was not all bad news for Perofeta, as rugby writer Gregor Paul suggested that the young man might be a good fit to join the Blues in Super Rugby in the near future, as part of a youth movement to help the struggling franchise.
"New Zealand U20 first-five Stephen Perofeta is winning admirers," Paul wrote.
"Eligible again next year for the under-20s, the former Wanganui Collegiate No10 has played for the Chiefs U20s but would surely be willing and able to switch allegiance if the Blues were to offer him a full contract.
"[Perofeta] was playing Heartland rugby while still at school last year.
"He has great acceleration, kicks well and is a powerful defender."