Usul (Muad'Dib) was sitting in the sand, thinking about the hallucinations he had, he just stayed looking at the sun, he was alone, waiting to see what to do, after a few hours he got up to go for a walk, he was walking carefully in the sand, until he saw someone unknown, someone from somewhere else. Possibly from the south.

He approached carefully, pulling the unknown person, grabbing it by the neck.

Usul "Who are you!"