Briony imposes her own story on what she has witnessed, in order for it to make sense alongside her other biased ideas of Robbie the maniac. McEwan’s writing here emphasizes the process by which Briony alone convinces herself that she saw Robbie—with no input from Lola, she evolves from suggesting Robbie’s guilt to asserting it. Vulnerable Lola, meanwhile, seems to be looking for a way to hide, and Briony’s confidence that it was Robbie provides that.