Whoever pointed out the corkscrew pattern of the plume was right. It was burning off fuel and momentum to keep it from flying out of the test range.
test missile. maybe launched way early.
Technical problem with the launch sequence that required an emergency launch/burn-off?
Or the FAA NOTAM that everyone seems to be posting here is in error, showing a DTG that is a day after the test.
Not too hard to believe that the information from DOD to FAA got garbled in transmission, leading to an erroneous NOTAM.
The other possibilities are all too terrible to contemplate.