Well, I wasn't online from 1:15 on, so wasn't able to watch the L2... I know from past experience (as far back as last run from .0019 to .02) that the MM's definitely scramble when this stock starts running, and that it trades very thin which gives us those runs...
That being said, I would assume that orders were taking a long time to fill, and would have guessed that the MMs were all over the place. This stock usually trades around 5 million per day, so today they HAD to be caught off guard.
Assuming that my "theory" on delaying the PR to get more of a bang tomorrow is correct, I think you will see them have an even harder time getting orders filled and we should see a VERY nice gain again tomorrow...
I've said it all along, with the way that ARTI trades, following the announcement of CSD I believe we see .03-.05 within 2 days of its release... And my guess is we start heading there around 8:30 tomorrow morning (the typical PR release time)
Chris