This is not a normal drop, this is due to the big volume of money being dump and not a big volume of sellers, so its a manipulation in short.
Despite this, it should not create panic among us who already witness this kind of movement in the past, market is unstable for now, but eventually it will bounce back as the pandemic will get its cure.
It is possible that only some of the whales did it while others did it because of the Coivid-19 effect so in my opinion it makes sense because the entire global market is also experiencing the same thing in its decline because they are afraid of quarantine so selling more at any loss is not a problem for him .
For market manipulation whether the whales will move quickly in these conditions or indeed they are more awaiting recovery from this pandemic because the problem is very serious for everyone.