"I've got a lot of Samoan friends. It's one of those things where you get a chance to do it at school but, once you leave, you'll never be able to do it again."
Most training happened after school and on Saturdays. The group also practised at lunchtime, and the sole "palagi" raised a few eyebrows.
Bellett was grateful for the support from his Samoan schoolmates. "They were really respectful about it," he said. "They actually realise how much hard work it takes, and they appreciate it."
By the time Polyfest arrived, St Peter's were underdogs. But they proved the doubters wrong at last week's big event, taking out the top award at the Samoan Stage.
Bellett and his pals had a much bigger impact than Cyclone Lusi, earning praise at Polyfest and in the days since.
Bellett posted about his experience with the Samoan group on Facebook and radio station Flava shared Bellett's post, to the delight of thousands this week.
The Year 12 student was heartened by the reaction.
"One of the reasons I did it was to prove to people you don't have to be Samoan to be in a Samoan group; Tongan to be in the Tongan group. You can just do what you want. It's just your heart that matters really."
The lads are performing again at today's St Peter's College Fair, as well as the school's Tongan and kapa haka groups.
Bellett hoped to perform at the Polyfest Samoan stage with St Peter's again next year. Next time, he may not be the only palagi.