The anima is bound to the mountain spirit because he has the secret which would make her live. Our modern consciousness has not given the soul enough room or enough life and attempts to exclude it.
Von Franz argues that the Mountain Spirit represents the pagan, chthonic reservoir of psychic vitality that modern consciousness has suppressed, and to which the anima clings in its need for a richer existence.
, The Interpretation of Fairy Tales, 1970thesis