Another Tasmanian parent has stormed out of the Hillcrest jumping castle criminal hearing, as the case examining the tragedy entered its second week.
Rosemary Anne Gamble has pleaded not guilty to a charge of failing to comply with her work health and safety obligations over the deaths of six Hillcrest Primary School children in Tasmania, on December 16, 2021.
Zane Mellor, Peter Dodt, Jalailah Jayne-Maree Jones, Addison Stewart, Jye Sheehan, and Chace Harrison died, and three of their classmates were seriously injured, in the incident.
The court heard a "mini tornado" tossed the jumping castle some of the children were on across the oval during the school's end-of-year Big Day In event.
Ms Gamble owned the company Taz-Zorb, which provided inflatable amusement devices, including zorb balls and a jumping castle, to the school on that day.
Ms Gamble is facing a hearing in the Devonport Magistrates Court.
On Monday, the court heard details about the WorkSafe Tasmania investigation and the work of engineering experts in the wake of the tragedy.
Since Friday, the evidence in the hearing has been less emotionally charged and largely focused on technical details related to weather, geotechnical and mechanical engineering.
However, when a geotechnical engineer's video evidence of soil and anchor tests conducted on the school oval in October 2022 were played to the court, a family's anger surfaced.
The video showed two men using sledgehammers to drive short star pickets into the ground.
"Doesn't look that hard to get them in, does it?" a victim's family member said, appearing angry, while leaving the court.
The engineer's evidence continued throughout the morning otherwise uninterrupted.
Prosecutors have alleged Ms Gamble failed in several ways on the day in question, including by only tethering the jumping castle with four pegs when eight anchor points were available.
However, defence lawyer Chris Dockray SC has said that given the unpredictable nature of the so-called dust devil weather event, there was nothing his client could have done to prevent the tragedy.
It is expected that prosecutors will close their case in the coming days, and the defence will begin calling their own expert witnesses later this week.
Although the hearing is due to run for two weeks in total, the court heard last week Magistrate Robert Webster may not deliver his verdict until next year.
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