As he say's in the books (LOTR) he dare not use his powers because it would be like lighting up a beacon to all who can read the signs (nazgul, sauron and others ) here is Gandalf.
in regards to return of the king I assume he's saving his energy for the confontation with the witchking.
in regards to return of the king I assume he's saving his energy for the confontation with the witchking.