When an elevator fall’s down that means all cables snapped and somebody removed the mechanical safety breaks with force (near impossible) but even then you would land on a cushion of air because elevator shafts are giant air traps.
All you need for an escalator incident is lots of people using it and one person to fall or a malfunction / idiot that makes it stop #didyoustickapennyinthatdoor?
https://m.youtube.com/watch?v=KaGNZi36znA