As Kessler heads for South America, we see him planning his movements, but not what is in his mind. Kessler is clearly very anxious to meet Martin Bormann again.
The surviving Nazi leaders have money and influence - and Kessler is becoming more of a liability than an asset to them. The last thing they want is another affair on the lines of Eichmann - so they go to ground, even for their old colleague.
Kessler is outraged by the way his old Nazi comrades have treated him - they evidently look on him as disposable, and the old S.S. man is on his own. He sees that he has the knowledge to create havoc by changing sides.