Considering human factors, feathering the props at flight idle seems not to have produced much in the way of flight path change, which may have contributed to it escaping notice until power was advanced without result.
Was the crew wearing headsets? Possibly that would obscure aural clues.
One pilot began to catch on, but handed control to the apparently oblivious erring party who continued to fixate on landing instead of restoring thrust.
While it may have become impossible to restore thrust in time, a controlled impact might have done better, had the crew addressed the problem.