Sparrow considered the position, it was becoming far too hazardous to remain and the mission had more than achieved its objectives. The last bit of information had been hidden for collection, but it would be critical if lost and therefore taking the news back in person would make sense.
But how to leave? Servants had to work all day and no one could enter or leave without a pass. At night since the death of the sergeant the sentries were far more alert than before. The two options were either to get sent on an errand, or slip away when the staff went to church on Sunday. The danger was that by running away, the authorities might link it to the death of the sergeant, therefore the need was to maximise the time before any absence was noticed.