Strangely, Selina walks in /after/ him. Was she here in fifteen minutes? Was she going to keep him waiting? Hard to tell, exactly, what is going on with her but the leather catsuit probably indicates some of it was involving potentially illegal activities. Did she follow Sherlock? That seems... far fetched, doesn't it?

The leather creaks softly as she sits down at the table with Sherlock with a small smile, "Time really does pass strangely here."