This is heartbreaking.
And it was forseeable. I think if you scroll back through this thread it was forseen. It's terrible design. I know it's not the only precariously-perched escalator in the world, but consider its use: it has to handle large quantities of people who are most likely to be young, likely to be in a rowdy state, having just emerged from lectures and movie screenings, and is subject to routine crush loads as hundreds of people come out of these buildings at once.
These escalators are particularly prone to falls because 1) they hang over open space (not entirely uncommon, I know), 2) they're conspicuously narrow, not leaving enough space to stand 2-abreast and pass and leading to crushes and 3) the up and down escalators aren't abreast, instead being separated in a ham-fisted attempt to drag circulation through the food court. This means that the passengers are exposed to a drop on both sides. If you assume that some passengers will be idiots some of the time, separating the up and the down doubles the chances that someone will take a fall.
Another forseeable calamity is that one escalator passes within easy arm's reach of a sprinkler-head hanging from the roof. How long before some excited kid reaches out, tweaks it, sets off the system, and pandemoneum erupts?
The nightmare of this thoughtless building is just beginning. Only now the consequences are more severe than offending people's tastes.