Rebekah
Rebekah asked Dave Cullen:

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Dave Cullen Definitely anything external.

It's been 26 years, and I can't recall what happened 17 minutes in. I think they left the library, correct? If so, we have no way of knowing for sure, but yes, all the experts I consulted*, it's highly likely that Eric got bored, as psychopaths do.

* I worked with some of the top experts in the world, most brought in to the case by the FBI, so they knew it well. This included Dr. Robert Hare, who literally wrote the book on psychopathy, and created the current definition/conception of what it is, including the famous Psychopathy Checklist. I spent a few hours with him, and discussed this very situation at length. Very little doubt in his mind.

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