It will be interesting to see from the eventual report, assuming nothing comes out beforehand, whether the problem that caused the pilot to turn back 50 secs before total engine failure was one that should have prompted an immediate shutdown of the first malfunctioning engine, to avoid its ultimate failure shrapnel damaging the other engine. Not pointing the finger at the pilot at all, who clearly did a great job with a double engine failure, but just maybe we should be shutting down engines sooner sometimes to minimise this risk? Clearly the counter risk is the limitations of flying on one engine. And shutting down the wrong one!