"It took at least a week and a bit ... I just thanked her and thanked her ... she was an angel."
The woman was Nevenka Pervan, and Ms Wathey said she didn't think she was a hero.
"I said 'you're a hero', and she said 'look, no I'm no hero', but I spoke to the medical team and they said if she had moved him he would have suffered severe brain damage."
Ms Wathey said Mr Marjoribanks was panicking, but Ms Pervan remained calm.
"She was his life-saver. She was there the whole time, she held him like he was her own while he was seizuring in her arms and she was calm and protective."
Zaybein, who was visiting family in Napier from Upper Hutt, fell headfirst while playing on the bouncy castle when an inflated column came loose and exposed a concrete hole, Ms Wathey said.
Everyone heard a massive "thwack" when he hit the ground, she said.
Zaybein has been suffering intense headaches in Starship Hospital and tires easily since the incident.
His memory of the event isn't good, but Ms Wathey said he remembers Ms Pervan.
"She is part of the family, now. As soon as he is better we are going to see her and say thank you."
The incident had been absolutely devastating for Zaybein and the whole family, Ms Wathey said.
"I can't believe it was concrete, I'm absolutely devastated. [The columns] are supposed to be attached, these are not attached at all."
Ms Wathey said Inflatable World, which has offered a $6 discount to the family, should be pitching in for the bills because of the incident.
"We don't want anything for us but just do something for Zay. He's not the same, he's the one that's hurting.
"Even when he comes home we'll have to have [a physiotherapist] come to us -- I don't know how we're going to pay for all that," she said.
She said it was "unbelievable" the accident came days after Deacon Rambaud, 4, was sucked underneath the bouncy castle at the Glenfield Inflatable World.
A video of the incident posted on Facebook has received more than 1 million views so far.
It is understood another person broke their leg at the Napier Inflatable World just an hour after Zaybein's incident.
Inflatable World director Gary Adamson said both Napier incidents were being investigated by the company, in conjunction with WorkSafe New Zealand.
Management decided to temporarily close the Napier Inflatable World on Monday while it fully investigated the safety procedures in place, he said.
The company's 10 other outlets nationwide were still operating.
Mr Adamson said he could not comment on the investigation while it was under way.
"We'll do whatever we can to help there but at the moment we're focussed on making sure that this doesn't happen anywhere else at Inflatable World and getting it right for the safety of our customers," he said.
"This is the first major incident we've had of this type across New Zealand and Australia."
A WorkSafe spokeswoman said it was making preliminary inquires as to whether or not it would investigate the incident.
WorkSafe had looked into the earlier Inflatable World incident but concluded an investigation was not needed.
An ACC spokeswoman said there had been approximately 774 incidents relating to bouncy castles or inflatable objects in 2014, and about 392 in 2015 to date.
The approximate data is compiled by searching claim forms for terms such as "bouncy castle" and "inflatable" in the accident description.
