"It's 9:43am, high summer beneath a glass-like sky and there’s a dazzling sun on a pastoral, some might say bucolic, Southland river. The upstream breeze triggers the grey-green tussock to radiate in rippling undulations below the steepening scrubland of the valley’s sides. We’re in the middle, Jeff Tyser and I, mulling over myriad crystalline currents [...]