I don't remember everything either, but I did look at that day a lot afterwards. It wasn't one quick swoop down. It opened high at .0045, then unexpected drop... and orders filled at .0028, then .0024... then a quick, brief drop to .002. After that, most of the orders filled at .0022 in the afternoon. It ended the day by jumping up to .0034 on a tiny 7k trade.
Either way we still agree that dilution was the most likely explanation?
News 
Market Data 
Discover 
