User blog comment:Battlemaster Grunt/What is the best Mass Effect? 1,2, or 3?/@comment-1786741-20120930195003/@comment-5607673-20121001022130

I just assumed they were passing information. Even with their arrogance, Shepard stopped Sovereign and Harbinger. They had to see him as a threat. Knowing that, it would seem quite ignorant if Harbinger hadn't informed the other Reapers about Shepard.