So that's what the tracking device was there for. To make us more frustrated than ever, clever! Walter's reactions and responses in this episode were as rivetting as Peter's concerns and desperation for his father. My whoa moment was the slight re-emergence of the once greater and possibly colder, crueler and more calculating genius that is Walter Bishop (or so it seemed to me) at one point during the interrogation sequence. I haven't seen the episodes aftert his yet, but Olivia may be right: maybe being insane was the best thing to happen to Walter!
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