Humans are not 'friends' of the Tuatha de'Dana and Edrick does not know what to think of the tiny voice that is calling out to him from Middle Earth--beyond the mystery of how it could even be possible for a human to make that connection with him. But the voice is filled with such terror he discovers he cannot dismiss it as merely a human problem. This is someone in desperate need.
His bond brothers, Uriel and Azael, are inclined to think that it is a human problem and one they must resolve themselves. Clearly, Edrick is not easy in his mind about it, however, and they decide to follow him to Middle Earth to discover what the call is about themselves.
