Profile kinda/sorta looks like an Emergency Descent profile. Down from 30k to under 10k in roughly 2 minutes, which IMO is pretty fast even for an ED. But it's not an unusual thing to recover at 10k due to pax being able to breathe without oxygen masks at 10k.
So really high rate of descent down, attempt to level at 10k, go below it in the recovery due to high rate of descent, climb back towards 10k but then what?
Just speculation but one of the few reasons I can come up with for that profile.
Nobody knows nuthin' right now.