If you found yourself rewinding to the beginning of last week's Criminal Minds episode after it finished, then you did exactly what the producers thought you'd do.
The episode closed with another ominous shot of the BAU's season-long unsub/stalker The Replicator going through photos of the team's closed cases. The final slide wasn't a photo, but a video of Blake (Jeanne Tripplehorn) teaching her linguistics class from the episode's opening, shot from the students' seats in the lecture hall.
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"Rick Dunkle wrote that episode ... and he pulled the director aside and said, 'We can't see that side of the classroom because people are going rewind ...