Person of Interest2011

Harold Finch:
If the killer is among these people, then he's out of his element; he's broken his pattern. Assuming the identities of his victims, it's part of his ritual.

John Reese:
And now that Rollins' ID is burned, he's trapped. He must have taken on another identity.

Harold Finch:
And he can't go anywhere with it. He's as stuck as we are.

John Reese:
Why didn't the machine give us his real identity? Why play games?

Harold Finch:
I assume he's smart, and he digitally erased his original persona. I did.