Rick is tempted to ask Quenton what he had first studied, but decides that now is not the time, especially with Henry wanting to see him. He follows his Sire's advice, and walks to meet his new boss. He's still more than a little intimidated by the boy, but their brief conversation last night seemed to have gone off well enough. Maybe this one would as well.

Finding himself in front of the door, Rick knocks on it twice. The detective wonders if this particular greeting was part of some elaborate magical ritual.
Or Henry could just be hard of hearing. But Rick wanted to make no assumptions until he knew the boy better.