Your marriage will be a complete disaster
Is Nick living up to his self proclamation of being non-judgmental?
(That's the correct sentence if that's what you're asking...)
The words that contribute to the tense mood of this passage are shake and nervousness.
The primary conflict in the Colomber by Dino Buzzati was when Stefano wanted to be a sea captain but cannot because of a belief that those who saw Colomber is doomed to death.
He was not able to pursue his passion because of his and his father's fears.