I think the bigger point is that the volatility of this stock says something about the markets approach to it. A 40% drop on a 205 share trade is not a good omen IMO.
Let's be honest there was no volume of any consequence here at all for a while now. Even the "big" days have seen < $5000 worth of shares move. I think the sell you saw today shows someone out there is looking to benefit from a downward move on MVTG though. Otherwise why literally give the entire principle on your trade away as commission.
I think we've agreed a lot since you came to the board, this is a hugely risky play on a low to no volume stock that is likely going to have to dilute to fund itself. But the lack of available shares/volume and low float will work in the favor of shareholders if things go well just as much as it will work against them if things go south.