The first time I saw it (in early previews) the stage remained really dark and a floodlight came from behind the staircase lighting just him as he climbed out of Hades. It was very pronounced and you knew he was just about to make it out. When he turns around a floodlight came on above her and she dropped really quickly and her arms flew up in the air reaching for him. It was very sudden, dramatic and quite shocking.
The other 2 times I saw it, the stage was more well lit so you couldn't really tell what he was doing or even that there was a staircase that he was climbing up because it wasn't emphasised with the floodlighting. He turns and looks and she starts to descend quickly about 3 feet and then stopped and then descended really slowly and after a while did this really weird knee bending thing to make it look like she was dropping quicker. It just looked very odd and took you out of the drama of the moment.
At first I thought it might've been a malfunction with the platform as it just looked so odd, but then it happened again the third time I saw it, so it was obviously changed to that. Maybe the fast drop made her ill or something or they are trying to 'milk the drama' out of the moment by slowing it down.
When she dropped really quickly it kinda took your breath away, whereas slowly it is just kinda meh and didn't hit you as hard as the fast descent did.