Carts on the escalator! Words fail.
RIP.
During my time in China I saw ,at a rough guess, two or three deaths a WEEK caused by advanced stupidity.
This was mid-ninetys just as things where changing ,supposedly.
Likely long escalating ramps (like conveyor belts) actually designed for carts. They are supposed to be made so that the wheels of the cart catch in the matting of the belt/ramp, preventing the carts from rolling on the incline until the end of the belt/ramp is reached.
We've been in a hundred such large stores in Shanghai, including many, many locations of that Lianhua chain mentioned.
Sometimes, it just doesn't work that way.