David Rossi:  I think he went back to relive his crime . When Zoe showed up , she became a victim of opportunity .
Aaron Hotchner: That 's the same theory we arrived at on the plane . He strangled her with her own scarf . He did n't plan it , I think she surprised him .
David Rossi: I told her not to stop until she found the answers she was looking for . I did n't think she 'd go to a crime scene .
Aaron Hotchner: Her mom said it 's something that she does all the time . She probably would have gone anyway .
David Rossi: But it 's because of what I said that she was encouraged to go there last night .
Aaron Hotchner: Dave , what are you doing ?
David Rossi: She came to me and I dismissed her .
Aaron Hotchner: Try not to personalize it .
David Rossi: I was the last _ one _ she talked to before she was murdered . How is this not personal , Aaron ?