Originally Posted by
atakacs
As they were having a hard time (and eventually failed) to maintain altitude I'd say you try to run both engine as long as possible. Even a failing engine can still produce thrust.
Not sure that we their plan all along but could explain it.
Depending on it's and the prop's state, could contribute a fair bit of drag rather than thrust, even if still technically running...possibly more than with it shut down and feathered, cowl flaps closed, etc.