"I was looking to hit a boundary, ideally a six, because it was quite tough the way [Mitchell] Starc swung the ball throughout the innings," Williamson explained. "I tried to keep the total out of my mind and just bat. It doesn't matter how you do it, as long as you do."
The Australians were subtle, too. Captain Michael Clarke made fielding adjustments within earshot of Williamson to pique his interest. He may as well have been trying to raid Fort Knox.
The theatre wouldn't have been out of place in London's West End as the runs and wickets ebbed and flowed.
Starc took 6-28 from nine overs with his devastating in-swingers as New Zealand wavered, despite reaching the target with 26.5 overs to spare.
The hosts were led by Trent Boult's maiden five-wicket ODI haul and an unbeaten 52-run fifth-wicket partnership between Williamson and Corey Anderson.
With Australia 48-1 after five overs, locals had every right to panic. Captain Brendon McCullum didn't. The slips were stacked and in-fielders enjoyed catching practice as Australia were dismissed for 151, their fifth-lowest ODI total against New Zealand.
Generally in Auckland, such a cacophony would result in a noise control call-out.
At Eden Park, the decibels were welcome.
The top 10 matches of 2015
10) Super Rugby final
9) Roberta Vinci over Serena Williams
8) The day-night test
7) Holly Holm stuns Ronda Rousey
6) Cowboys' golden triumph
5) All Blacks thrash France
4) Breakers win title at the buzzer
3) Williamson six gives Black Caps win over Australia
2) Revealed tomorrow
1) Revealed Thursday