Tasmania Police constable Dean Wotherspoon was one of the first officers to attend the Hillcrest Primary School accident on December 16, 2021.
Students Addison Stewart, Chace Harrison, Jye Sheehan, Jalailah Jayne-Maree Jones, Peter Dodt and Zane Mellor died after a freak "dust devil" wind gust lifted the jumping castle into the air above the Devonport school grounds.
"I think the phrase perhaps is organised chaos," the leading forensic officer told an inquest on Wednesday.
"There were a lot of people doing their utmost to save children.
"Police officers, school staff, paramedics all doing what they could. It was nothing like I had seen."
An inquest, which began on Monday, is examining the circumstances of the tragedy, safety processes and whether there were any departmental deficiencies.
Rosemary Gamble, the operator of Taz-Zorb, which set up the inflatable equipment, was in 2025 cleared of criminal workplace safety breaches.
Zane's mother Georgie Burt on Wednesday stormed out of the hearing room and said the jumping castle operators should be in jail as Const Wotherspoon was shown photos of tethering pegs.
The forensic officer had been at the site of a fatal car crash when he was radioed at 10.30am about a significant incident at the school.
After he arrived, he said initial command measures were confusing and, as crime scene coordinator, he made a mistake by briefly leaving to photograph children at the hospital.
A 7pm deadline to have all items moved off the school oval meant he wasn't able to source data on pegs, including how much force was needed to pull them out of the ground.
"I would have measured the angle they were in the ground at, rather than just a general observation," he said.
Const Wotherspoon said he was unsure whether his inability to get that level of data compromised the investigation because he wasn't privy to a subsequent regulator probe.
"As a forensic officer, we usually arrive to a controlled scene," he said.
"We had structure, but in my opinion it was confusing.
"I wasn't quite sure who I was directly reporting to. We were getting tasking from multiple sources."
A blower used to inflate the castle, thought to have struck one of the children, wasn't packaged as an exhibit, potentially resulting in DNA contamination, Const Wotherspoon said.
Some items were not photographed as per procedure, but that didn't materially impact the forensic investigation, he said.
When he arrived at the school, Const Wotherspoon helped provide CPR to Zane.
The boy was unresponsive and was declared dead at the oval about an hour later.
The constable placed a white blanket over Zane before going to help Jalailah Jayne-Maree, who was being put on a stretcher.
The jumping castle was lifted 16 metres into the air by a "mini-tornado" on what was an otherwise calm morning, the coroner has heard.
Police evidence suggests the castle was tethered at four of its eight anchorage points.
The inquest will sit again on Friday, with further hearings to be held in November and February.
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