I've rewatched the episode 3 times now, ignoring the obvious clues/red herrings (fear of birds, middle aged, good posture, able to creep silently), and that one moment on top of the church, just before he extends his arm to PJ says a lot to me. In a body language sense, i read that he feels totally in control, almost as if he's sending a message to PJ, saying "I don't have to rescue you, i can kill you at any moment, but why spoil our game?"

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