"Well, yeah." It's not like Cal was planning to show him the DVD and then not watch it. That would just be mean.

Plus he kind of wants to see it now, too.

"There's more." His annoyance with the other Sherlock is evaporating rapidly in the face of being the one who gets to know something first for a change.

Seriously, there's no way Sherlock could somehow deduce this. He just couldn't.