Mr Tew approached the other two and invited them on to the field for the presentation of the Bledisloe Cup to All Blacks skipper Richie McCaw. One man took up the offer with his mates, the other declined.
NZRU spokeswoman Juli Clausen said it was unclear if Mr Tew had been able to contact the woman, who was discharged later on Saturday night.
All Blacks wing Cory Jane told media he heard the fireworks go off but didn't see the aftermath.
"There was a big bang. I was watching the Aussie guys and they started shaking because it was loud."
The display was created by Van Tiel Pyrotechnics, contracted to the NZRU to provide part of its pre-match entertainment.
Owner Dr Martin Van Tiel said the company was extremely distressed by the incident, which was unprecedented in its 20 years.
"We sincerely apologise to the spectators that got hurt. We hope they recover quickly."
He knew something was wrong when the explosions were a lot louder than normal. The company is working with Worksafe New Zealand and the NZRU.
Eden Park Trust Board chief executive David Kennedy said all pyrotechnic displays at the ground were on hold pending the outcome of the investigation.
A spokesman for Worksafe New Zealand said it would be making initial inquiries this week.