This should actually be reassuring to you, if anything! Planes can maintain altitude, fly long distances, and land safely even in the event of both engines fail

This should actually be reassuring to you, if anything! Planes can maintain altitude, fly long distances, and land safely even in the event of both engines failing or blowing up. Also, when you hear them power down near landing time, they're still actually running and providing power, but are no longer providing thrust.