How does Fortunato react to the Adjutant's reprisal?

Mateo laughs at him.

"You little scamp, you know very well that I can carry you off to Corte or to Bastia. I will make you lie in a dungeon, on straw, with your feet in shackles, and I will
have you guillotined if you don't tell me where Gianetto is."

The child burst out laughing at this ridiculous menace.