Whale dance aka massive sell order for 0.369079 in the book

We are seeing some pretty wild moves in HBD today, mostly to the upside. HBD has climbed to the $1.05/HBD level. This would probably not be unusual as the self-balancing mechanisms are working quite well.

But what has me quite puzzled is the Sell Order at 0.369079 HIVE/HBD of almost $20k.
Anyway, be prepared for a few more moves as we have a whale in the pond.!!

Keep calm and have a nice day