The movie proves itself engrossing by Cal's standards, definitely not the kind of dry and cerebral thing he had assumed it would be. It keeps his attention, though he also glances at Sherlock from time to time to watch him watch it.

(When the Sherlock on the screen tells Watson, "It makes a considerable difference to me, having someone with me on whom I can thoroughly rely," Cal's expression flickers as the familiarity of the comment registers, but he brushes it away.)