His first thought is to get out of there, while he has the chance, while Sherlock is outside and too far away for even a vampire's speed to get between Cal and the door.

(The tragic act a few minutes ago was good, but he doesn't buy it. Reed Chandler had faked his compliance pretty well for a while, too.)

But - no. That's leaving everyone else in danger. At the very least he should tell whoever's on Security right now. Leaving a note won't cut it. A note will take too long to find.

Cal stays where he is and scans the crowd, looking for one of the familiar badges.