What situational irony occurs in “The Colomber” by Dino Buzzati?

What does it meam to write about something that went well today and reflect on its causes

Ineed simplifying this thesis and making it easier to understand for the reader (more concise) "no matter how religious one may be, one’s faith tends to change under unexpected and challenging circumstances."

Which work would represent a change to the artistic medium of this original work?