In his way, he was trying to draw a conclusion regarding something he had observed on photographs of the murder victims. He asked his boss if she was a knitter but then said he realized she had grown up in a family of boys. What he noted was there were knitted items on both bodies and that they were executed by the same person, the tension being the same. He is an observant little cuss. Anyway, later, he discovers a lady on a bus route who knits and she sells her items and that was the thing in common that the murder victims had, they rode the same bus route and got their knitted items from her.