Mark E. has the video, he posted part of it on Facebook. It was very difficult to see any storm movement (except away from us) because it was so dark. As for the blip, there was no discernible movement except that it remained there for several minutes. We didn't even notice it until now because the lightning was so scarce. The storm was much larger than it looks in this screenshot, and had gotten smaller. There were several wall clouds that we could see while it went passed us, and while driving north of that town I noticed a very large, and defined inflow tail.