Originally Posted by
212man
I believe it is as caused by freewheel units slipping leading to two engines shutting down through over speed and the third going to an idle power setting due to some FADEC logic.
In my opinion, the FADECs would be responsible for all the engines' behaviour. In this case one of the engines encountered different conditions and so the FADEC responded differently. It shouldn't be inferred that one FADEC behaved in that way due to the other engines.