Dunedin arguably had the better of the match at Miller Park this afternoon. But with the score locked 24-24, Te Hiwi pounced with the match-winner much to the delight of the home fans.
The outside back knocked over the conversion to seal a 31-24 win and clinch Green Island's first semifinal appearance since 2002.
Two years ago the team had to survive a promotion-relegation match with West Taieri, so it is a remarkable turnaround for the club.
Taieri nabbed top billing with a 17-15 win against an understrength University side at the University of Otago Oval.
Kaikorai thrashed Zingari-Richmond 74-24 at Montecillo but missed a spot in the semifinals.
In the other game, Southern beat Alhambra-Union 40-33 at Bathgate Park. Alhambra-Union picked up two bonus points and avoided the wooden spoon. That dubious honour goes to Zingari-Richmond.
Taieri will host Green Island in one semifinal, with University at home to Harbour, who had a bye this week, in the other.
Video supplied by Elevate Analysis