"It was obvious we needed to regroup and have a good look at the video and what's going on out there," Spithill said.
"You've got to be smart about it. If all things were great we wouldn't have played it, but we have to be honest with ourselves. One thing this team is good at is we're very candid with each other and we're very direct. And it was obvious unless we make some changes there's a good chance we weren't going to win the second race of the day."
After a nervous stumble in race four on Monday, Team NZ's massive upwind advantage was further underlined yesterday, as Dean Barker and his crew turned an eight-second deficit at the bottom mark into a lead of more than one minute at the top.
They were aided by a howler of a tactical blunder by Oracle at the bottom mark, when a disastrous foil-tack rounding allowed the Kiwi boat to power in behind and instantly negate the advantage Spithill worked so hard for at the start.
Team NZ tactician Ray Davies said with the boat able to sail higher and faster into the wind than Oracle, it gives the crew a lot of confidence that if they find themselves behind, there will be passing opportunities upwind.
"The boat is going really, really well. It's seriously quick upwind so it makes my life a lot easier," he said.
Spithill said his team would be going through a painstaking review process overnight, examining all the footage and data from the first five races, before getting back out on the water for a solid day's training in today's rest day.
But there appears to be very little they could do to their boat in the space of 36 hours to negate their rivals' speed advantage.
Team NZ skipper Dean Barker said once they start tinkering with foils and rudders, there will be trade-offs that have to be made.
"The good thing is they're obviously a little bit rattled now and they've got to make some big decisions because they'll probably try to shut down the advantage that we have upwind, but there's obviously other things that go with that," said Barker.
Spithill, however, said there was plenty his team could do to improve their performance.
"It's all on the table, there's enough time to make appendage changes, sail changes, changes to the crew - we will go back and really look at everything."
It is Spithill's last comment that is the most intriguing, hinting there may be changes to the crew before Friday's next two races. The Oracle skipper did little to quell speculation that tactician John Kostecki may be replaced on the boat, saying he couldn't guarantee there wouldn't be changes to the afterguard.
Asked if he feels secure about his own position on the boat Spithill replied: "You can be a rooster one day, a feather duster the next."
Postponement card
Each team have one opportunity to enforce a postponement during the America's Cup match. There is no stipulation that it can be only for breakages or gear damage; it can be used as a strategic option if desired.
