Yes, I remember the passage now; Ged flees from Benderesk and Serret as a hawk and nearly loses his human personality. Yes, there is a very close analogy there.
Reading of Helen's fear that Mabel may not return, as T.H.White's Gos did not return, I'm also reminded of the opening of Yeat's The Second Coming:
TURNING and turning in the widening gyre
The falcon cannot hear the falconer;