Tubby Linton
I've been wondering that myself.
As a very speculative guess, I would say that they were using the V/S on the automation and possibly forgot about it, or were otherwise distracted.
Taking from memory from some previous posts, they were pretty fast, pretty close in.
I know I have used the V/S mode to work a descent and speed change.
As a further guess, I think they set the MA altitude somewhere along there.
If that is the case, there would never have been an altitude capture.
I saw your earlier post, and I think you are are on the right track.
Regards.