wow that's rare, but it doesn't say engine failed ("pilot might have closed the throttle", and they didn't give themselves much time from 120ft over a built up area. Also the old chestnut of putting the lever down to preserve RRPM crops up. (though also ideep in HVcurve too). Every possible thing will happen to some extent. there was (apparently) once a case of an engine failing on a twin whilst it was climbing upwards and backwards, doesn't make it a good idea tho
In UK we have far more twins embedded in roofs than singles.
If at all this twin (engine redundancy) concept should be limitted to aircraft above a mass threshold, if at all. It is just not justified nor justifiable for light helicopters.
Is it true about Paris? Anyone know?