Final answer:
The text lacks sufficient details to identify the exact situation involving Patrick and Omri, but it suggests a moment of tension or danger that causes Omri intense fear, often used in literature to build suspense.
Step-by-step explanation:
The question seems to reference a specific scene from a story, likely from a novel or short story, but without the text's title or more context, it's impossible to provide an accurate and specific answer. In scenes like these in literature, a character experiencing a "heart hammering with fear" suggests a moment of high tension or danger, whether psychological or physical.
The character Patrick is presumably going through a distressing or frightening event during lunch that causes Omri to react with fear. The emotional response mentioned is commonly used in literature to create suspense and to draw the reader into the character's intense emotional experience.
Without further details, it is hard to ascertain the exact circumstances that Patrick faces. However, if we look to similar literary examples, such moments often involve a sudden threat or an unexpected event that disrupts the safety or normalcy of the setting, which could be anything from a confrontation with a bully to a more fantastical occurrence, depending on the genre of the story.