"In the last couple of games I have gone back to what I usually do and it's sort of working out for me. I just need to stick to it."
When it works, there are few better sights in rugby league. Tuivasa-Sheck has incredible footwork and speed, as well as remarkable poise and football intelligence for a player so young.
Even off the field, he copes well with the attention and when he stumbles, as when he thought Wembley was where they play tennis, he composed himself and came armed with a good statistic (the number of toilets at Wembley) for when he next faced the media.
He scored nine tries in 25 games for the Roosters last season and produced a club-high 19 linebreaks. At the World Cup, he scored eight tries in six games, including a double against England in the Kiwis' semifinal victory.
He will be remembered more for the final, when he limped off after his first carry with a fractured leg. It was an injury he sustained against England but he was cleared to play. In hindsight, it was the wrong decision.
"Training the whole week I felt sweet, I felt right," he said. "It was only in the warmup when I started to feel it and I asked the doc for painkillers. My first run it happened. I was shattered.
"I was taken up the tunnel and then collapsed on the floor. I just wanted to lie there and sulk all day but the doc told me to get back on my feet and to support the boys."
To compound his misery, he saw from the bench the Kiwis being dismantled 34-2 at Old Trafford.
Tuivasa-Sheck once again combined with Dean Whare on the right edge for last night's Anzac test, and both could be a fixture in the side for years to come.
Both have time on their side and are seen as among the best in their positions, although Tuivasa-Sheck looks destined for a switch to fullback at club level.
They also forged a good understanding during the World Cup, exemplified by Whare's over-the-back, diving pass to Tuivasa-Sheck to score against England.