Whipsaws, from anonymous
On the last two announcements, whatever they were, the market did a big whipsaw which could be defined by big motion up, then down and vice verse in a short time equivalent to the range of the day around the central starting point. It didn't seem to matter what the announcement said. Crude has had some similar moves but were not related to the announcements mentioned above. The timing on crude was different also.
It might be analogous to the seismograph motion on an earthquake when the tectonic plates slip, or a heart attack type event on the heart scope.