I don't think they were Hibsing it, I think they were just fucked. Remember they already played a proper game against Wales last Sunday, when Australia had a much easier time against Georgia the day before. There was a lot going against Fiji there, not to mention losing both Botia and the scrum half who was having the game of his life quite early in the second half.
I loved that anyway, brilliant from Fiji, hope they go through.