Varför stryker överste frågorna med skisser?

Jag Tänk att han tar bort orelaterad information.

Jag är helt obekant med boken och filmen, men efter söker i Google boken Jag hittade följande passage som verkar matcha bilden / beskrivningen ovan:

The top copy of Kowalski's confession came with the coffe. The first time he read the twenty-six pages of the dossier quickly, trying to grasp the gist of what the demented legionnaire had been saying. Something in the middle caught his eye, causing him to frown, but he read on the end without a pause.

His second reading was slower, more cautious, giving greater concentration to each paragraph. The third time he took a a black felt-nib pen from the tray int he front of the blotter and read even more slowly, drawing the thick black line of the ink through the words and passages relating to Sylvie, Luke something, Indo-China, Algeria, JoJo, Kovacs, Corsican bastards, the Legion. All these he understood, and they did not interest him.