Because the elevator decended 84 floors doesn't mean the cable snapped immediately at the start -- express elevators are fast and shakey, there's no way to determine at what floor the cable actually snapped.
It could have accelerated too fast, and the cables snapped only when it started to slow down, which it probably would have anyways for the remaining 10 floors. they may have only free fell one or two floors, if at all. Cable probably snapped just before they started to hear the clack clack clack
It could have accelerated too fast, and the cables snapped only when it started to slow down, which it probably would have anyways for the remaining 10 floors. they may have only free fell one or two floors, if at all. Cable probably snapped just before they started to hear the clack clack clack