I am easily confused these days....comes with my approaching senility I assume.
The use of hydraulic power is prohibited:
in hover,
in climb,
in flight at IAS < 30 kt (56 km/h) and IAS > 80 kt (148 km/h
So as long as the aircraft is in level or descending flight between 30-80 its....you can use the "extra hydraulics".
Now what possible use can one get from that?