Why do we burn holes in grasshoppers? 'Cause we can. We have - had the power.
[Karev doesn't know. This is just his frustration fueled thinking.] They can watch what we do and then just reset us to default. Pretty good for situational trauma information gathering, don't you think? It's all in our heads but they're also in here with us. Why the hell else would they do what they're doing? For our benefit?