Pair were shopping when the freak accident happened.
Across the Northern Region, three people have died and 62 have been rescued in just over a week.
One expert says it's as simple as sitting around the dinner table.
The woman was a resident at Radius Elloughton Gardens in Timaru.
A review is now underway.
And the figure is on the increase.
"It's only going to get worse".
The worker suffered knee ligament and joint damage in the fall.
It was also ordered to pay the worker more than $45,000.