In the fifth episode of the HBO thriller-comedy , titled " Jump ," the stakes shift from a romantic getaway to a high-speed pursuit. The episode marks a dark turning point for the series as the playful "running" turns into a dangerous game of "chasing". Key Plot Points

Unknown to Ruby and Billy, their actions in the aftermath of the jump were witnessed by a bystander. Episode Themes

The episode forces the characters to choose between calling for help and protecting their own freedom, pushing them further into criminal territory.

After Billy’s former assistant, Fiona, steals a bag of cash and jumps off the moving train, Ruby and Billy are forced to dive out after her.

The discovery of Billy's ulterior motive shatters the romantic fantasy he and Ruby were building.