With arms folded, he glared at me, and I was terrified by his glance.

Terrified, that is the word! The glance was not that of a sane man.

Indeed, it seemed to reflect nothing whatever of humanity within.
I repeated my question in a more challenging tone.

For an instant I thought that Robur would break his silence and burst forth.
"What do you intend to do with me?
Will you set me free ?" Evidently my captor's mind was obsessed by some other thought, from which I had only distracted him for a moment.

He made again that gesture which I had already observed; he raised one defiant arm toward the zenith.