User blog comment:Markurion/How many of you put a bullet in Godchild in EC?/@comment-2250460-20120717205450/@comment-2228120-20120719051749

Given that Shepard watched the kid from the window of his detention cell and that the kid lived nearby, it is possible that it was not the first time Shepard watched him - what hasn't been explained, though, is how the Catalyst knew that the particular kid was haunting Shepard.