Sins had a way of studying people that apparently unnerved them - they seemed to be able to see, to inherently know things people might not wish to confess. Pride had been told that by numerous interviewers and other mortal acquaintances on countless occasions; but even though he was currently being studied by another Sin, he still was not entirely sure he could understand why they felt that way.
"I was unaware of Mammon's return until today, and whatever dispute they have between them only ever requires my attention if they want it to be my business." And even then, they could count on Pride not to be the one jumping in to save the day and clean up their mess for them.
"Even if I do not necessarily like that they are getting outsiders involved. Regardless, I would hope that you choose not to intervene, either."