Any of the following could be happening:

Sacrificial sell into the bid - where a large bid was waiting - to see if weak hands would follow - they did - and then take all available undercut ask when selling dried up. More likely to be the case, if followed up by .0005 getting slapped without the 39M bought at .0004 being put up for a flip.

Flippers from .0002/.0003 from March 21 to March 28 taking a profit by bid whacking.

A largish holder exiting.

Shorting aided by bashers.