Yeah guys, it's definitely an advanced chi-blocking or something of the sort. We witnessed the Lion Turtle put one claw on his forehead and the other on his chest. Aang repeated the same process to Ozai.
But Amon did the forehead and
the back of the neck. I'm pretty sure the back of the neck is some sort of pressure point.
And look what I found on Wikipedia under the "pressure point" article.
And "Qi" is also spelled chi.
So considering this is true, he's obviously pulling the "blah blah blah spirits came to me" because he's either A) crazy or B) he wants to assert his dominance over his following.