Here is the final report from the NTSB.
According to them, it was a loss of control following a partial engine failure...
https://app.ntsb.gov/pdfgenerator/Re...Final&IType=FA
The Australian safety board has published some information about managing partial engine failures. Of course, the most important item for most of the event is Airspeed, Airspeed, Airspeed.
https://www.atsb.gov.au/publications...al-power-loss/
https://www.atsb.gov.au/media/411527...10-055_no3.pdf