A subtle evocation of Richard Donner's Superman makes the film's trajectory obvious. Directors Justin Pemberton and Michelle Walshe combine home video of McCaw as a heavyset and extremely athletic farm kid discovering his talents, family interviews and dreamy reenactments, all under the low rumble of McCaw's voiceover.
It's clear where all of this is going, but McCaw surprises with his mental rigor (he excelled academically) and total commitment to his sport (he plays with a stress fracture in his foot). He's a meticulous strategist who attends to tiny details and has cultivated multiple habits of highly effective open-side flankers. He's almost preternaturally calm despite the multiple pressures of his final season, through early victories and three stunning midseason losses. This is the film's "Rocky Sawing Tree Trunks" moment, in which the hero aligns his values and actions and rallies for the climax.
The haka is a traditional Maori war cry and dance sequence performed by a group, a pregame tradition of the All Blacks; McCaw's parents reminisce early about the preteen Richie practicing the haka in the backyard. There's nothing else like it in sports, and when the directors frame the whole team for McCaw's final booming haka, it's pretty clear, even to Americans, how this whole thing is about to play out.