Guilt was an old acquaintance of Cathair's. He lived with a great deal of it, from the usual Catholic Guilt to the weight of his crimes. He hadn't meant to make her feel guilty. Likely of all of them, she had the most right to be angry. It wasn't just her life that was in danger.
"All right," he said. He pulled out a pocket sized notebook he'd filched from one of the shops and offered it to her. "I've been working on a crude map of the town. The cottages are are marked military style, with American designations. RiffRaff, she's another prisoner, suggested this was MI6's doing, but everything smacks of Americans, not the British. The Commissioner uses American grammar and spellings."
Why was he telling her all this? Because she practically reeked of either law enforcement or military experience. Which meant telling her this and showing her his map was going to save her a lot of trouble and walking about that she oughtn't be doing in this heat in her condition.