Moa feared he might not be allowed to continue when he suffered a heavy head knock in the 12th minute when trying to make a tackle in the leadup to Greg Bird's try that, if he had been in the ring, might have seen the referee call off the fight.
He was wobbly on his feet and dragged from the field to undergo a concussion test but was even more influential on his return. "The guys were calling me Alex Leapai during the week and I felt a bit like him as if being on the end of a big punch," Moa said. "I came off but I got assessed by the doctor and he reckons I passed the test with flying colours, not that I remember much about that. I went back on the field and just tried to contribute. "It probably kicked me into gear. I try to avoid head knocks. They're not too good in the long run."
The performance of the front-row rotation will give coach Stephen Kearney plenty to think about ahead of this year's Four Nations, because Martin Taupau was another standout performer on debut.
In the background is not only Waerea-Hargreaves, but also Ben Matulino, Sam Rapira, Frank-Paul Nuuausala and Sam Kasiano. It's one position where panic doesn't set in if there are a series of injuries.
Moa has been a revelation since returning to the NRL last year and, at 27, has age and experience on his side. He played only a few minutes of one NRL game for the Sharks in 2008 before four years with Hull FC in the UK Super League.
"I felt really old [in this Kiwis side] and said to myself at the start of the week I needed to be a bit of a leader.
"As a rugby league nation we can be excited about the way the young guys played. It was a big ask for a lot of them. There's still a long way to go for us to be on par with Australia but we can certainly take positives out of it."