> If the blades are still angled to produce thrust, then instead of the blades taking a bite out of the air, the oncoming air will start to take a bite out of the blades, so to speak, driving the propeller, and thus the turbine, in reverse.

Minor correction for the author, a unfeathered prop continues to rotate in the correct direction. The flow of torque is reversed, not the actual rotation of the prop.

Indeed under certain circumstances the prop can end up speeding past its design RPM to the point that the prop tips become supersonic creating a whole world of other problems and dangers.