
This is the best scene in the show.
The music elevates this scene above the entire show for me. The Guru was also the best use of spirituality in the entire franchise. His use of it is minimalistic and humble... mysterious almost. We are left with questions after him. Before him all we know is that there are element benders, but he uses an unknown (to us) power to sense Aang and guide Appa.
The Guru and the cosmic aspect of the show are absolutely defining moments. I actually think Book 2 has a better finale than 3.