Is it just me, or does it look like the engine in the picture had not been turning at the moment of impact. If it had, you would expect fractured or bent blades all around, not just on one side, wouldn't you? Could suggest they suffered a flame out.
The missing blades presumably would have been around 6 o'clock position and were ripped away on impact, but since the engine wasn't turning, the blades that were closer to the 12 o'clock position were preserved. Sound plausible? Or am I thinking too much of props?