Energybending vs Taking Someone’s Bending
Again we can compare how Aang’s method and Amon’s differ.
Aang touches two chakras, Amon only one.
For Amon’s way of taking away bending only the touch on the forehead seems to be necessary (he never touched Tahno’s neck). No visible glowing is involved, either.
Aang touches two chakras and we see him glowing both times, even tough in Yakone’s case the glowing is a lot less strong than in Ozai’s, it is still visible.
Another thing I found interesting. Take a look at the gif. Amon seems to be pushing down on that man’s forehead with visible strength, as if pushing something in.
Is this a kind of bloodbending that locks chakras/chi flow? A kind of physicial advanced chi blocking that requires no bending?
Energybending: Part One
Energybending: Part Two