Well, that's one way to decouple. Someone is liquidating big time
Why wait for the weekend though, they should of done it yesterday.
There were huge ask walls hovering above $20k trying to extract the max value, looks like volume at $20k dried up so they decided to push lower, now hovering above $19k looking for buyers. But you are right, timing feels nefarious, Fri night into Sat in US, like long squeezes back in the day, so no one could get fiat into exchanges till Monday.